All the advice online is about filters being jammed on lens and not moving. This filter is turning but not screwing off - anyone have any tips?! Don't recall anything drastic happening that could have damaged the filter and warped it.
Broadly my thoughts......as in is it perhaps a Circular Polarising FilterWhat kind of filter is it? Just wondered if it's in 2 parts, and the part you can turn isn't attached to the threaded section?

You need to grip the ring behind the front part, as that spins freelyYes it's a circular PL

such an error never happened again Been there...done that!@dan_yell
.I had neglected to unplug it from the mains and to say the least I had a 'shocking surprise'such an error never happened again
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Those Amps are hungry little thingsit's amazing how much steel 240v can bite out of a blade before the fuse pops.
I've never done *that* but I did put a brick bolster through a live mains cable once - it's amazing how much steel 240v can bite out of a blade before the fuse pops.