Many thanks for the replies it is interesting how the term is used and interpreted by both communities.
In general I think the term is only used sparingly by radar but I do feel the phrase is over used in the local environment. Asking crew to expedite vacating reflects the fact that we seem to constantly operate to minimum separation for much of the day at LHR.
Having seen a 767 go off the end at BHX it does concern me to have to try and land and vacate on runways and exits that are often not well lit or uneven or slippery when wet.
I think it reflects unfavourably on the commercial environment eg BAA, other airport operators etc NATs all desperate to make money.
Regards BP