UPDATE: Peter will be guesting on the upcoming episode of "Toast of London" (series 3 episode 2) "Beauty Calls". The Radio Times describes his role:

"Joining Toast and flatmate Ed Howzer-Black (Robert Bathurst) is Peter Davison – the real Peter Davison, as in Peter Davison of Doctor Who and All Creatures Great and Small fame – but as a version of himself who enjoys making (and drinking) illicit booze and who never does the washing up."

~Pockets