Neither launch or AS/R unit - they were picked up from the sea by a 2+1/2 ton army truck.
https://en.wikipedia.org/wiki/DUKW
No.1 Amphibian Training Wing Royal Army Service Corp immediately sent three of their DUKWs from the seafront and rescued W/O Kania and LAC Gibson within 20 mins.
The same unit asked the next day for permission to salve the aircraft from the sea bed - this was given and they successfully brought the wreckage ashore and handed it over to No.34 MU.
Ross
Bookmarks