I don't think so ... although as far as I am aware there is no direct UK authority on this matter (or wasn't when I studied it). HOwever, there is persuasive authority from Singapore (obviously merely persuasive, but it does come from the highest appellate court) in Chwee Kin Keong v Digilandmall.com Pte Ltd (despite being a case primarily of mistake, general issues of contractual formation in the electronic environment were also discussed) that the receipt rule would apply. This was based on such things as the Electronic Transactions Act which seems to support such a contention (which, in turn, is based on the UK ETA, see s15). But note, the ETA is procedural and not meant to be substantive. Also, the Vienna Sales Convention on International Sales seems to impose receipt rule in the absence of a contrary intention... should a different rule apply to domestic contracts? Singapore is a signatory of this, I am not sure of the UK's status.
Of course there are counters to this, but emails are, 99.9% of the time received almost instantly and take no time at all to be processed thru servers. The debate could go either way, but in the absence of any discussion of the issue by the UK courts you have to draw guidance from elsewhere. Of coruse, if soemthing has been decided since I studied contract I apologise for this.
As fireman John says there are added problems in the electronic environment but these are overcome by the cases on faxes, or I think it would be - ie ignoring it if received within business hours would not be allowed.