The use of an Angle Grinder

Good luck! FYI - the angle grinder I have is a mains one but a) I'm not ever at my house so you'd need to arrange to pick up from a forum member who also lives there b) You may need a new blade for it as it's in the cellar and probably hasn't been used for 5 years.

I've heard horror stories of needing 8 blades, so I would come prepared. We'll see how it goes tomorrow though.

Argh.