Thanks stalion; according to a google search it IS a trojan. I've quarantined it using the MSantispyware which recommends removal. Is it safe, do you think, to let the MS programme remove it? It seems the easiest way.
I've downloaded hijackthis and will post a copy of the log to the malaware forum. Er, where is the malaware forum?
I also quarantined this item then contacted BT helpdesk who assure me that the btwebcontrol.exe is part of the broadband system and should NOT be deleted. Return to your anti-spyware system and unquarantine this item. OK! You can program the spyware to ignore this as it is not a threat to your system .