Thanks for that. I assumed as much - the trouble is, I have no idea how
to achieve that with what I have! Having the two spare live wires
connected together and not on the programmer left me with no heating at
all.

As the heating is running for now, I'll porbably just leave well alone
until Sunvic's tech departemnt come back from holiday on the 5th Jan,
and then take it up with them.

Thanks,

David.