I've ordered from them twice, and twice they've got it wrong.
First time, I bought five chainring bolts, and they sent out four. I called, and they posted them both out, the missing one was with me in the morning.
Second time, I bought six tyres, and they sent 4 incorrect ones.
I phoned them up, and they asked me to send them back. I said I wouldn't, because it would mean I'd have to walk a couple of miles with them to get them to the post office or pay for a taxi, so they offered me a £5 gift voucher. I said my time was worth more than £5. They then said "Fine, how about a £10 voucher?". I said no. They then said to keep the tyres, and that they'd send the right ones free of charge, which arrived this morning.
Give them a call, they're reasonable people so long as you don't lose your temper.