I know the French police reports for 1804-05 have lot of reports of British prisoners escaping, some of them while on parole. It is also stated there that it was mainly officers of the merchant navy and that none from the Royal Navy had absconded. A story is repeated that the king had turned his back on a military officer who had returned after breaking his parole and insisted he should not be employed. The Duke of York, however, is reported to have said, in effect, that he didn't see a problem with officers who had been held as internees rather than as prisoners of war. All this is from the police reports.
I know the Times followed this story throughout the war and that it annoyed Napoleon who published figures of British officers who had broken their parole; the Times, if I remember rightly, insisted that none of them had been employed but I don't know the truth of this.