Thanks very much for the quick reply.
The only thing about the worcester instructions is the third neutral connection from the thermostat - here's a snip from the manual
Can I ignore this if i'm using the CM927 and connect the L + N supply, then A and B terminals to the two end...
I've got an old worcester 350 combi boiler fitted in the garage, but with no internal room thermostat.
I've taken a look and seems to be simple enough to fit - from the installation manual just connect to terminal block 4.
for the thermostat I've been looking at some wireless honewell ones...