Earthenware Vase J S or T S initials - John Shelly? I.D. help appreciated.

Another mystery vase I bought years ago. I have already checked my studio pottery marks book and bispm.  I wonder if kind experts would take a look and advise. The closest I could find was John Shelly but I think a little different. many thanks

I've got a jug with a very similar mark  impressed in a circle just under the handle.  It's in red earthenware, neatly thrown with a rather Winchcombe-ish wave pattern.  Sorry I can't find it now to give a photo of the base, but it's flat (no footrim) and wiped clean rather than having wire marks.  

Thanks for comments and photographs. Much appreciated. Many years ago I had a lamp base with a similar mark. I thought then it was John Shelly because of its style and influence. It has long gone so I think I will just enjoy this vase a little longer, kind regards and many thanks