Thanks to Malcolm for these pics. He said this on the airgunbbs.com:
I recall ‘playing with’ one of my Dad’s air pistols as a lad in the 1950s, and hung onto it when we cleared his house after his death a few years ago.
Cutting a long story short, trying to de-clutter, I took it, along with a couple of sheath knives, to the Police station, to be destroyed. However, the PC who took it in had an interest in weapons, and thought it looked unusual, so did a bit of investigating, phoning me to say a local dealer had identified it as a Frank Clarke Titan Mk1, a fairly rare air gun.
It does look identical to pictures of that air gun, so it didn’t get crushed!
Video of firing this pistol: