03 Zafira
The connector is on a clip under the door card, plus there's a rubber grommet to seat in the door framework.
Pretty sure my old Cavalier was an easy swap, just unscrew the fixings, and unplug like your Astra Sir Trev.
At least my mirror was the plain version & I i got it for £20 plus P&P off Ebay.
The old ones no good to repair, the tunc who kicked or thumped it off, did a thorough job