FRs Contract with Swissport
If I remember rightly FR signed a reasonably long term deal with Swissport at STN in late 05/early 06 for around 7 years. Bit sketchy on the exact detail.
That's not to say they may try and wash their hands of it as I don't think Swissport are making much money from it at the moment hence the recent 60odd redundancies.
My guess is this is one of the numerous ramp rumours that fly around every airport (no pun intended), some people seem to always take these as facts.