Vanessa ParadisGuibbaud Christophe/ABACA/Press Association Images

H&M is offering customers a £5 voucher when they bring in a bag of unwanted clothes. Some of the clothing will then be used to manufacture a 'green' brand for the company. The rest will be recycled.

So is this brilliant, green deal a must-have, or is there a catch?

The scheme is part of its recycled and organic clothing range called Conscious. The entire collection is made from more sustainable materials, such as organic cotton, recycled polyester, and Tencel. Vanessa Paradis (pictured) has just signed up to model the range, and the new collection will be in stores from March.

So is the deal any good?

The deal

The shop seems to be offering something for (almost) nothing. You can take in up to two bags of jumble a day, and get a £5 voucher every time. It has not announced an end to the scheme either, so you could potentially snap up £1 worth of clothes at your local jumble sale this weekend and turn it into £10 of vouchers. The vouchers will be valid for 6 months, so there's no rush to spend them.

However, there is a hefty catch: in order to redeem each voucher, you'll need to spend at least £30. It means if you want to get £10 off, you'll need to spend £60.

It's not quite the incredible bargain it seems. However, it's still well-worth considering. Most of us have something hanging in the back of the wardrobe that we'll never wear again, so we may as well earn something for them.

Alternatives

It's also the best jumble deal on the high street. The other big name to run a programme like this is M&S, which will give you a £5 voucher if you take M&S clothes to Oxfam, but you have to spend £35 when you redeem the vouchers.

It'll also enter you into a £100 prize draw if you choose to recycle clothes in M&S store collection points instead - but there's no guarantee you will see any benefit yourself.

The vouchers are handy, and the green agenda is impressive too. Both H&M and M&S have recycled ranges, and both are doing their bit to stop clothes going to landfill.

In the UK, around 1 billion items of clothing end up as landfill every year - that's 114,000 items an hour. M&S has actually stated the bold aim of recycling as many clothes as it sells by 2015. Playing your part in hitting that target and reducing the clothes sent to landfill can only be a good thing.

The only question is whether you ought to do your bit by taking unwanted clothes to the charity shop instead, or whether you should cash in and get yourself a voucher.

What do you think? let us know in the comments.