Old hot-water tank issue.

[WHPES]

Not an angle grinder. A reciprocating saw and a suitable blade for cutting metal. Hire one. Take a couple of spare blades on use or return just in case. Ear defenders and eye protection absolutely essential too. Watch for sharp edges.

Be careful not to damage your reciprocating saw. I burnt out an expensive Hilti saw recently by chopping up something similar!

 

[The Bedwetter]

WHPES Trusted Plumber GSR
Be careful not to damage your reciprocating saw. I burnt out an expensive Hilti saw recently by chopping up something similar!

No worries, WHIPES, it's my dad's reciprocator.

Thanks for the info, guys.