RN Post War submarine rebuilds

[JFC Fuller]

I have been looking at the RN T class submarines and their post war service, in particular there reconstructions. A large number of the boats seem to have survived into the 60s but I have only been able to identify 8 welded boats and 5 riveted as having undergone reconstructions. My question is really two fold;

1) How many boats was it originally planned to upgrade over all and

2) How many were all welded?

Furthermore does anybody know if there were any plans to upgrade the S and V classes. I know that HMS Scotsman was used as a trials platform or streamlining and quiet propellers and the V's were all but abandoned post war but was any consideration given to further use?

Thank you in advance sealordlawrence.

Thank you in advance sealordlawrence.