I would advise caution with regard to CoinFloor for a few reasons:

• It is run in part by Nefario, someone tagged as a scammer on this forum (who still owes me and others BTC from the shutdown of GLBSE).
• Given he is CTO of the site, his GLBSE security record should be recalled.  There was a significant theft from that site (~3500 BTC I believe).
• Also worth considering that every single bitcoin exchange in the UK so far has been cut by banks backing.

Trading through BitBargain and LocalBitcoins is by far the most secure method.