<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by christep:
Allow 30 mins to do this, but might be easier than getting the TA to do it.</font>
Unless it's the T4 flight connections BA desk at LHR, in which case allow 3 hours and expect to be ripped off an extra 25 quid (in addition to the USD75).