Highball trials unit-where?

Peter wrote:

Didn't want to create a new thread for this so tacked onto this one.

21 Sqn, whilst based at Gravesend with Mosquitoes recorded the folling in their ORB for 19/5/1944 - "Highball was carried out during the day"

This could refer to another highball, perhaps a mission type but suspect there wouldn't be two code names of the same name in the RAF. Any ideas?

Kevin wrote:

Further thoughts on my recent post.

Reference Post 17 and the accident to Mosquito DZ579/G on 25 October 1945, this aircraft was prepared for service in the Far East with 618 Squadron, and although delivered to the squadron on 11 September 1944 it was not shipped abroad. Instead, it was assigned to 27 MU on 18 November 1944 then Vickers on 18 December. As John says, it went to MAEE.

At least two Mossies were used for Card trials post-war, being TR33s TW228 and TW230/G. The TR33 had a solid nose, so these are not in the photographs opening this thread. However, they would be prime candidates for WJT’s Spilsby reference -- and handy for Wells-next-the-Sea range. (Earlier Highball trials here had been against HMS Malaya, which was by then decommissioned for “bombarding duties”. She was sold in 1948 so may have still been at Wells for Card trials.)

DZ579 should have windscreen wipers, which were a Far East mod. It is difficult to see if the photographed aircraft is thus equipped. It would also have had a hook and armoured windscreen.

With most of the Highball aircraft in Australia during 1945, the only ones remaining in the UK at the end of the war were:
DZ471/G Vickers
DZ530/G possibly extant
DZ541 became 6500M
DZ543 fate unknown (FE mods, but no later record)

That does not leave many spare glass-nosed Mossies as candidates. But, there again, it is difficult to see whether the aircraft in the picture has Highball mods.