Heard a crew once ask for the 'Full Service' once. Think that was KLM or Brussels Airlines but it sounded even better with the accent!
However on a more serious note, we have a laugh and a giggle at these interesting replies that we hear but are you surprised? The vast majority of foreign crews have no idea what different ATSOCAS are available in the UK. Such information is neither close to hand or easy to read when under time pressure during the pre flight stage or whilst en-route.
If a pilot from a commercial flight does not know what your asking him then I would suggest it gets noted with the operator being contacted. Holders of UK ATCO and Pilot licences all got a free DVD with a presentation of the changes. Was the same sent to the foreign operators who frequently fly in the open FIR?