Afternoon one11,
You have it
It is the Lancaster MkII (LL735) being used to test the Metropolitan-Vickers F2/4 "Beryl" engine.
Development of the F.2 continued on a version using a ten-stage compressor for additional airflow. The new F.2/4 - the Beryl - initially developed 3,250 lbf (14.45 kN) and was test flown in Avro Lancaster Mk.II s/n LL735 before being installed in the Saunders-Roe SR.A/1 flying boat fighter. Thrust had already improved to 3,850 lbf (17.1 kN) for the third prototype, and eventually settled at 4,000 lbf (17.8 kN). In comparison, the Derwent developed 10.9 kN in its ultimate form; making the Beryl one of the most powerful engines of the era. Development of the SR.A/1 ended in 1947, ending development of the Beryl along with it. Nevertheless a Beryl from the SR.A/1 prototype was removed and used by Donald Campbell in his famous 1955 Bluebird K7 hydroplane in which he set seven water speed records between 1955 and 1964.
300 Lancaster IIs were built with 1,650 hp Bristol Hercules VI radial engines
one11 has control 