Time is running out to spend your old £1 coins

£1 coin warning, cut debt and shift to 0%, free Coke Zero, ‘free’ Chessington tickets and 25% off Sainsbury’s TU.

These are our Money Saving Expert Martin Lewis’ Deals of the Week.

Remember, deals can change quickly, even while I’m on the programme. So always double-check the terms and conditions before spending. Plus, while I hope these deals will save you cash, don’t spend if you can’t afford it, don’t need it, or won’t use it.

A warning for everyone with a piggybank – your £1 coins will soon be unspendable

Everyone with a piggybank or coin jar needs to turn them up upside down and shake out all your £1 coins, because as of 15 October the current £1 coins will cease to be legal tender and will soon be unspendable. They are being replaced with new 12-sided £1 coins from next month and by 15 October, shops will no longer accept the old pound coins.

From that point most people will likely only be able to redeem them if you go into your own bank or building society, so far easier is to take them out from now on and not put any more in the jar.

If you find that upsetting (I understand, I’m obsessive too) then simply replace the £1 coins with other notes or coins to the same value – that way your savings pot won’t be used up.

And while they’re unlikely to be in piggybanks, it’s worth noting too that from 5 May old five pound notes will also be unspendable, as they were replaced with newer plastic fivers last year, so if you’ve got any – use them up. And as the fivers are produced by the Bank of England not the Royal Mint, Banks don’t have to accept them after this date – so use them or deposit them in your bank quick.

If you are left with any you can exchange them in person or by post (at your own risk) at Bank of England in London.

New. Shift sub-£600 debt to 43months 0% AND cut it too

A balance transfer card is where you shift debt from an old card to a new one at 0% for a one-off fee – then all your repayments clear the debt rather than just servicing the interest. And a raft of new cards are now giving cashback on top when you transfer your debt – so that effectively means if you've small debt of under £600, not only will it be interest-free but it’ll cut what you owe too.

Imagine Ivor Littleowing has £200 on a typical 20% APR credit card, so it costs him £40ish interest a year. If he shifts it to a 32mth 0% there's a one-off say £1.40 fee (0.7% of the amount shifted) but it gives £20 back a couple of months later. So by shifting the debt he only has to repay £181.40 and it's now at 0%.

Yet don’t just apply for it in hope – what really matters is whether you're accepted – Martin’s ‘Balance transfer credit card’ guide includes an eligibility calculator which shows your acceptance odds for most top cards so you can home in on the cards most likely to accept you, minimising applications on your file.

Currently, the top cards that this works on are… Halifax which gives up to 32 months 0% for a small 0.7% fee, and gives you £20 cashback when you transfer £100+. Or Lloyds gives you a guaranteed 32 months 0% if accepted, for a slightly higher 0.8% fee and £20 cashback on £100+ transferred too. HSBC gives 32months 0% for a higher 1.4% fee, but gives you £25 cashback when you transfer over £50. Or if you need longer to clear your debt then until next Monday Halifax is up to 43months (the longest ever) for 3.28% fee, and gives £20 cashback.

Plus remember to always follow the Balance Transfer Golden Rules:1. Repay at least the monthly minimum or the bank can end the 0% deal.2. Clear the card in full by the end of the deal or the rate rockets to 18.9% rep APR on these cards.3. Never withdraw cash or spend on the card as it’s not at the 0% rate.

Martin’s Quickies:

Free £1.35 Coke Zero: Download the Greggs rewards app on your android or iPhone, and register your details by Tuesday 21 March, and you’ll be able to get a free bottle of Coca-Cola Zero Sugar 500ml bottle (normally £1.35) in most stores (some are excluded). You don't need to buy anything to get the freebie. Open the app click on 'Rewards' and scan the barcode. You have 28 days from downloading the app to claim or until all 100,000 bottles are gone. If you don’t want free coke, you could get a free regular-sized hot drink instead – but this is only for newbies who download the app. Existing app holders who have had the app since 8 February, have until 7 March to claim the free Coke.

Two ‘free’ Chessington and £10 Legoland tickets: Until Tuesday 28 February, collect 10 different tokens printed in The Sun (50p weekdays, or 70p on Sat £1 Sun) and you’ll be able to swap them for two free tickets to Chessington World of Adventures, to use between April-October 2017. Once collected you need to send them by post with an application form selecting five date bands in order of preference (you’re given a date on a first come, first served basis, depending on availability) by Monday 13 March. There are 87,500 pairs to give away. The cost of buying the newspapers, and paying for a first-class stamp, will cost you £6ish – yet with adult tickets costing £49 each on the gate, this could save you up to £92.36. A great deal if you want to go. You can only make one application per household.

Or, collect four codes printed in The Times (£1.40 weekdays, or £1.50 on Saturdays), and The Sunday Times (£2.50) until Wednesday 22 February and you’ll be able to exchange them for two tickets to Legoland Windsor for £10, plus a £1.50 booking fee. You can submit your codes online from Wednesday 15 February and select a date to visit between Friday March 10 and Monday May 15 (again on a first come first served basis and subject to availability). If you subscribe to The Times and The Sunday Times you can get this offer without collecting codes. All in you’d pay around £17 for the tickets, and as adult tickets at Legoland can cost up to £60 each on the gate, this could save you up to £102.90.

Sainsbury’s 25% off Tu Clothing. Go online to Sainsbury’s or any store selling it and you’ll get 25% off most Tu clothing, including menswear, womenswear and kidswear until 11.59pm Monday 20 February, or until store closing time. There’s no discount code, the discount is applied automatically at checkout. I had a look earlier and saw a men's parka coat for £22.50 (was £30), a boy's Lego Batman pyjama set for £8.25 (was £11) and a girl's pleated skirt two-pack for £5.25 (was £7). Delivery is £3.95 for orders over £15 or you can collect from a Sainsbury’s store for free.