Dface
Retro Guru
It’s all kinds of strange to me. Holes in the top tube, some small clip brackets under down tube, dropouts and behind bottom bracket look fairly basic stuff.
That’s what I thought. I got another with it that I think is actually a Barron. I am in Lincolnshire.Barry Barron used to build frames - at a guess I'd say that's a basic cooking frame that's been modded with a few braze-ons.
The holes in the top tube are for cable clips, looks a lot like BSA Tour de france to me, the other observations you made align with that. I believe they were sold under several brands, essentially raleigh at heart.The stamped dropouts and kickstand bracket leads me to think it's a gas piper