Good morning
Thank you for the responses on this post.

I field stripped the gun this morning,
overall it looks quite clean.

Reassembled and tried again.
The Cocked pin protrudes at the base of the handle.
Inserted empty clip.
Pulled trigger, same as before, no resistance.
Recocked, tried pulling the trigger 2-3 times, click!
Works when persuaded as such.

Sounds like something is gummed up.
Is there something I could check, clean when the gun is field stripped?

Thank you