Adding an isolation valve to a copper pipe

[glitch]

Having a problem with the inlet valve on the toilet in my downstairs cloakroom and need to replace it, but the idiot who installed that bathroom many years prior to my ownership hasn't put any isolation valves in the pipe run to said toilet which makes working on it a PITA.

This is what the current setup looks like and there's a lot going on! What's the best way to sort this out and add an isolation valve and a nice new flexi-hose?

 

[glitch]

To be honest, can only see half of the situation - What's at the other end of the flexi?

The inlet valve for the flush. Flexi screws straight on to it.

My bathroom has: straight copper - service valve - straight copper - flexi - inlet. You might be able to insert a valve between the flexi and the elbow there.

You could also get a scrap of solid copper or even plastic pex to bridge the elbow to the valve, and everything should fit nicely I think.

Breaking down what I have... is the copper pipe coming out the wall likely to have been threaded for the right-angle connector, or would that be a compression?

 

[glitch]

Replace the push fit flex with something like this, would be the easiest way. https://www.screwfix.com/p/flomasta...with-isolating-valve-15mm-x-1-2-x-300mm/169fa

Mmm, not a huge fan of flexi-hoses with isolator valves built-in. Would prefer to fit a dedicated isolating valve if I have the option.

 

[glitch]

Fair enough - threading copper might not be a thing, but given the other bodges in this cloakroom I wouldn't be surprised if they figured out a way!

Is removing the olive likely to be problematic?

Appreciate this is crystal ball time as nobody can see the damn thing IRL other than me, but there ain't much pipe coming out the wall to play with and would likely need to be a removal rather than a cut.