http://www.geocities.com/otter12thav...ergallery.html
More shots of the "Deceptioon Otter" here. No reg noted on the paintwork though.
Other clues:
It seems that the BAS Otters were red overall and did not display their Falklands registrations:
Decal option #5 is a DHC-3 Otter used by the British Antarctic Survey serial number 294 and operated in Antarctica between 1959 to 1964. This plane was allotted the registration VP-FAK but it was never applied. The colour scheme of this Otter is overall Bright Red.
(Webpage doesn't show the scheme but does show a decal sheet - includes RAF roundels - although they also include XL710 so not conclusive!
http://www.aircraftresourcecenter.co...207/MD7207.htm