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As long as you only have 1 open pipe/way for water to escape at a time then you will be OK. As I said before, if you disconnect a pipe, there will be 2 ways for water to escape from, therefore you must only disconnect at a point where there is a isolation valve on one side.

If your system is NOT sealed and has an unsealed central heating cold tank in the loft then this may be of help. Drayton make an item called an Easy Drain Kit. This kit basically comprises 2 tapering plugs. One of these plugs is used to seal the expansion pipe to the loft tank and the other is...