Finally after eight years and four Bavaria’s later I have sourced the 13amp socket to replace the standard continental “Schuko” socket on the 240v panel and in the galley. It saves using a 13amp/euro converter (but a tad more expensive).
One snag with Furneaux Riddall is that you need to open a trade account and need a VAT number to do that (which I have fortunately). Fitting is a DIY job – but don’t forget to disconnect the shore power lead first!
They cost about £6 each and can be delivered (FedEx). I bought 6 (for the new boat) and the delivery charge was just £6. I received them within 24 hours of ordering (and you don’t need a VAT account!).