Well chaps -got a reply from SB and instructions on checking my electronics box- so I took that out and guess what?- The DEC motor cable had become unplugged. Plugged it back in and hey presto- mount now has two beeps on start up and homes with the joystick.
Hooray!!
Thanks for everyones help
Now to get it all back on pier and scoped up again!
Cheers
Relieved Graham.