>> There's a mechanism
>> to latch/unlatch the arm to the chain. It doesn't appear to latch. If I partly
>> open the door manually then it will operate.
>>
>> I suspect the latching mechanism needs a 'learning' sequence to tell it when the door
>> is fully shut and fully open,
Ours - a Clopay (pretty well the standard one used in the US) sectional door and Chamberlain door opener - stays engaged all the time. There''s a red toggle to pull to release it in case the power goes off.
As for locking, I was a bit miffed that the door came with the hole for handle already on the outside - the one I'd seen (I got it from B&Q many yearsa go) wasn't drilled. I fitted the lock and locking bars but they're held open with screws to stop them inadvertantly locking the door. Must admit I've never tried, but I believe the door can't be opened manually unless the opener is unlatched.
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Garage door opener new
Garage door opener new