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Originally Posted by Leehebs

Thank you EFB , I did not notice the UB instead of U. What was the difference with U And UB. I know there were coastal and deep sea boats maybe that's it. Ah found it, UB are coastal Attack boats. Bit strange having the same ID numbers.

Indeed! in a UB-boot "U B mo' careful' or a ASW trawler'll get ya' HMT Swansea Castle 4 example:
Photograph of King George V and Queen Mary with Lieutenant Commander J. H. Pitts inspecting a Navy trawler used for minesweeping...I'd imagine they'd've "spliced the mainbrace" for the occasion!