Which "Overclockers" are you referring to.
I deal a lot with click here and they are very good.
Reasonable prices (not necessarily the cheapest), next working day delivery, a very good after-sales policy (Dabs cannot claim that under any circumstances - see these forums), and a helpful staff.
I have always found them to be not only curteous but very helpful as well.
In fact when I had a problem in March-May they sent numerous e-mails and phone calls, spending hours, to sort it out for me.
If in fact it was the same "Overclockers" then they must have been having a very bad day.
Overclock.co.uk do not offer "price matching" because they offer something that Dabs most certainly do not, and that is helpful advice.
Advice in choosing the correct parts can save a lot more than a couple of quid discount. Taking time over the phone to be helpful is worth its weight in gold these days.
As you can see I can only speak the highest praise for them.