cutting pipes - no space

I haven't a clue what professional plumbers do. This is just me:

If it has to be cut there, then a hacksaw/junior hacksaw/padsaw may do the job. If the pipe is accessible (at both ends) further away, it is sometimes easier to cut out a section of pipe, cut and solder in the joints that are needed and then join the section back in.

It sounds like your cold is on the mains supply. But why are you reading mira instructions if you think that they are too expensive and so, I assume, that you aren't going to buy one?

How about one of the flexible saw blades? Wrap it around the pipe and just pull it to and fro.

============================ Have a look at these:

They need a working clearance of 18mm / 22mm (15mm / 22mm sizes)so they may not suit your purpose unless you can gain an extra few millimetres of working room.

Cic.

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Jigsaw with suitable blade?

Would a Dremel drill suffice?

That's exactly what I would suggest too. I have to say that I haven't used one in anger but the plumbers working in the hospital where I work use them all the time. I had a play with one (a pipe cutter not the plumber) and they do seem very easy to use.

Thanks for the replies, think I can do it with a hacksaw, was just worried about getitng a good 90 degree cut. The reason i was looking at mira instructions was just to see what generally was the procedure as i expect they're all pretty similar. Yes, the cold water is mains, so I guess I'm going to have to pipe cold from the header tank (22mm like the hot?). A pain as it's a good 5m from the bathroom.