Boiler lose pressure over few weeks, water coming out

[joesoap1]

newer rads seal on an o ring, older rads you can use ptfe and a sealant (if your just doing odd bits then fernox lsx is worth getting), when you drain, open the bleed valve on the rad you want to drain down (once the system pressure is down a bit). chuck the lot in all in one go is favourite

Hi Studips,As I told OP, homebase has express on offer, so opted for that.Going to put it in loop, run circs and Gravity rad for 1 hour, then turn rads on 1 at a time, starting with ones I cannot get to pipework, as i presume the leak is where I cannot see.Does That make sense? Thanks for advice, much appreciated.