I've been trying to sort out more pics but struggling at the moment, so no base pic.
The foot is not quite round, very slightly misshapen. There are tool marks on the foot and lots of wreathing in the glass. There is no pontil mark or if there was a pontil rod removed it has been firepolished so smoothly as to be invisible. The centre of the foot on the base is slightly pushed up so it doesn't touch the table, otherwise the base is completely smooth. The foot has been applied to the stem or vice versa and you can see where the glass is thicker down near the foot.
I've checked Gulliver's and done other searches and all I've found it one very similar identified apparently as Stevens and William, but I couldn't find any back up for that.