"cisco kid" wrote in message
om...

Hi All - Is is possible to have the radiators pressurised from a
rising main filling loop if the hot water cyclinder is of the Primatic
type.

No, not at all.

At the moment both the hot water and radiators seemed to be
filled from the hot water cyclinder via a single cold water tank.

That is how they work. You have to replace the primatic with a normal
indirect cylinder. Then the CH circuit can be pressurised from the mains.
The boiler has to be suitable for pressurisation and use a pressurisation
kit of: vessel, high pressure relief valve, filling loop, pressure gauge.
Get a quick recovery coil cylinder.