I've got an historic problem with my glow worm boiler losing pressure quite regularly and needing to be re-pressuriused manually.
I've had a the boiler serviced, the pressure release valve cleaned and then replaced
All, fingers crossed, looks ok at present, but if its not, am I right in guessing it must then be a leak.
If so, any tips on what next so I'm prepared. Are there any products like you used to be able to get for your car radiator that filled leaks somehow?