Many thanks to all the people who responded to my call for help.
Just to answer some of the questions asked;

The pic resets/hangs only when the relays have a load(motorised valves connected).With no load the circuit works fine so i guess it is the contacts that are the problem not the coil

I have a brown-out circuit on the mclr which uses a pnp transistor to pull the pin high.I havent put a capacitor from the mclr pin to ground(with a series R to the pin) yet but will try that.

My only other thought is that the relay commons(240v) are on the same pcb track as the input to the pic psu.
I wondered whether separating these out and feeding the board with 2 live input cable would be better(and maybe a 275v vdr on the input to the psu)

Many thanks again

Dave

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