I'll admit to being a bit of a plumbing novice.

My central heating system has a gate valve which I use to turn the water
supply to the radiators on & off. I thought that if I turned it off then I
could drain the CH system and replace two radiators.

I drained the system down & removed the radiators.

However, when the missus switched the hot water on for a shower, hot water
started coming out of the pipes which feed the radiators.

As I said, I'm not a novice but I'm sure this can't be right.

I want to leave the radiators off for a couple of weeks as I want to plaster
behind them and fit new rads. I won't be able to do this if I get hot water
shooting out the pipes everytime the hot water comes on.

Can I simply put compression stop ends on the open pipes where I've taken
the rads off?

Any help at the moment would be greatly appreciated.

Please don't reply. Got an answer off the Screwfix forum.