Portreath, 31Oct’44, amongst several aircraft dispatched between 0715 and 0810 hrs is mention of Mosquito XIX TA411. The No.1 Overseas Air Despatch Unit ORB (AIR 29/471) records “All these aircraft arrived safely except MOSQUITO XIX. TA.411 which is missing. No news of this aircraft has been received. The crew were F/O. DEAN and W/O. ENTWISTLE.”
Hope this helps track down fuller details of the crew as there is no mention of their initials. Noted that while ORB states Entwistle, on the CWGC his name appears to be spelt as William Entwisle with the other gent being John Anthony Dean.