Thanks for the agreement on this, I was pretty sure it was the wrong thing to do.
It is a Grant Vortex boiler, very big unit stored outside with oil feed, not something I have ever had before so was a little uncertain.
I am now a tenant but still have my own properties, moved to Scotland with...
I recently had a new combi boiler fitted and it was requiring charging every day. I called company to say that there must be a leak on the system. The guy came out and fitted some connection to the mains, I am assuming it is a pressure regulating valve.
I think the leak must still be there...