On 25 Jan, 14:25, Grimly Curmudgeon
wrote:

It'd need to be some sort of **** to use an angle grinder on steel, in a
dry dusty loft space.

Yes, absolutely.

I couldn't believe that was suggested the first time around and now
it's been wheeled out for another airing. Many plumbers can't get
insurance cover for soldering in lofts because the incidents of whole-
house conflagration are innumerable.

I wouldn't be seen dead using an angle grinder on a tank in a loft, so
to speak.

A cheapo Black and Decker jigsaw and a packet of blades reduced mine
to manageable segments; cut into 4 parts I seem to recall.
The rivetted construction looks like armour plate but they are less
formidable than they look.