Sorry I've just found this but I'll leave the photo as ATCO's has been deleted.
Originally Posted by
vintage ATCO
A 'one off' twin tailed Percival Prentice Luton Airport 1947/48.
VN684 c/n PAC/007 was a 1st pre-production aircraft which was awaiting collection at Luton 27.8.47. It returned to Luton on 21.5.48 for fitting of the twin tails for handling tests. Declared Non-Effective Airframe 1.12.49 it went to Halton as 6703M 3.12.49.
In the background is Avro 19 G-AHKX still extant at Old Warden.
BAE Systems Hertitage, Warton - Hunting Percival Archive