edi_local, I think you are confusing deportees with refusals. Refusals should not require an escort as it is often just a paperwork issue e.g. no visa where one is required or invalid passport; it is then the responsibility of the airline who brought them in to take them back. Deportees on the other hand don't want to leave the UK and may be fighting not to leave so are being escorted. Then there are extraditions and prisoner transport which would always be escorted. I don't believe all airports and all airlines accept escorted travel but I could be wrong.