agh
I had issues with a maclaren bought from mothercare....
this was a few years but then mothercare buggies had a 6m warrentee, maclaren 12months (but i know bugaboo have a 2 year garentee, so guess yours does too)
The Maclaren we had major issues with (the wheel and bit of metal that wheel was attached to literally sheered off, leaving a razor sharp piece of metal by charges foot, and the buggy trying to collapse itself, luckily DB was around otherwise no idea how i would have got DC out without badly cutting his leg)... anyway.... took back to mothercare where bought from (no receipt) & made a huge fuss. Little boy was < 18m, and this was the 'car / shopping centre pushchair, and it had hardly been used at all....he had a pram, another buggy for at home, and 3 wheeler for off road and a different buggy on the yacht) & mothercare staff agreed it had hardly been used.
Anyway i had to really really really argue with them, as they wanted to CHARGE ME for looking at it 
... eventually they agreed to send it off free... had to return to store loads of times to sort / argue... i must have gobe back 3 or 4+ times to discuss something...
long story short maclaren agreed it was faulty.... were going to fix, i went to collect it fixed and it STILL wasnt there.... made another huge fuss and got the whole entire £89.99 that was paid 15months ago for it (not the current selling price of £69.99) even better my boss was so impressed at how i had fought and fought she let me keep the £90!
be prepared to argue and have them tell you its not up to them, it the manufacturer (well yes, but as THEY sold it THEY are liable, end of (if you are in the uk). I spent rather a long time quoting sale of goods at to them (this buggy WAS dangerouse) but i won in the end.
was quite stressful though! & staff were not always "helpful" either
Good luck