Hi Tony
Mumbles is like the Gateway to Gower, have a look at the attached Google Earth image. Our Club racing takes place in the Bay in the bottom right, and our annual Gower Cat Challenge race's first leg is to Oxwich then back to Mumbles then across the Bay to Port Talbot which isn't shown.
In my opinion it is definitely worth revisiting and competing in the F16 G.C would be the icing on the cake.