OK wrapping this one up. Returned the Dick Smith transmitter for a credit - thanks Dick!
Bought the actual transmitter from the door manufacturer. Instructions to program seemed complicated, since it seemed I had to reset all the remotes and reprogram them all. A telephone call later and but once I'd identified the appropriate buttons on the receiver, I was able to simply program the new remote and leave the existing remotes untouched. All working fine now.
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