Calling Phantom phanatics

Here are two close-ups of the tail of the Phantom at East Fortune.
I have always been intrigued by the leading edge of the tailplane, where a not particularly aerodynamic-looking “slat” is attached, looking rather crude.
Can one of you experts please tell me what it is there for? Is it a “slat” or something else?

peter, It looks like your camera got all blurry-eyed (with tears of happiness?) at the crucial moment!

VZ608 RB.108 conversion

This picture probably shows the Meteor in its initial configuration, with a flush dorsal intake for the RB.108, which could swing up to 15 degrees either side of the vertical. Converted by F.G.Miles Ltd at Shoreham, first trials were at Tangmere, first flight of the RB.108 on May 18, 1956 (although not started up). Then to Hucknall, starting in the air for the first time on October 23, 1956. By June 1962 these trials were complete, but VZ608 was then used for ground erosion trials for future Harrier operations. SOC September 29, 1965.
Picture and text from pp. 144/5 of “Gloster Meteor” by Barry Jones.

Swift

This was the Swift two weeks ago . . .

Here is a photo of a naked Merlin on the Lancaster at Nanton – perhaps someone is able to indicate with arrows on the photo just where your items are located.
Regarding ID, that’s not my field, but I would guess that any numbers you can find on parts would help!