Ah yes, the N registered 412 SP ended up as G-SPBA in 1989 and went to Great Yarmouth.
It spent some time on trial to Conoco working the V fields, then Amoco to the Leman and Inde. It never really caught on as the customers didn't see the advantage over the 212 as being significant enough to justify the increase in price.
Actually, it did have advantages in terms of IFR range due to its fuel capacity and speed but wasn't as good in terms of deck landing and take off. Since Amoco would wait until the weather improved to fly, it didn't really have the opportunity to show its talents and eventually disappeared from GY.