How long for a faulty item can you return?

Benson

I purchased a Gro-egg from mothercare and within 6 months it became faulty - apparently a very common fault.
They exchanged it albeit with a grudge as the receipt i had stated 21.99 and they sell them for 22.50, not sure why this was a problem but they had to call managers and checked their systems as they said theyve never sold them at 21.99??

Anyway i got the new one and suprise suprise this is now doing the same thing.
I emailed Gro company as i couldn't locate my receipt, i am yet to receive a reply!
However last night i found the receipt. Its slightly older than I thought (thought it was approx 6 months but this is actually how long ive used it, i actually got it 03.10.10)

With the problems with Mothercare last time, are they obliged to either refund or exchange as it is within 12 months just.

somethingcorporate

It is down to yourself to prove that the fault is inherent although this can be costly and difficult to do with some items (as with yours I wouldn't know where you could take it to get such an opinion).

If I were you I would go in and be polite and see what they do. Read the FAQs with regard to how to proceed if they say no.