Thank you for your time in responding.
To be honest, I was aware of the no right turn at Markhouse Road (main junction not too far ahead of the turn I made) so I thought the no right turn sign I saw on my right (which was still quite small) was an indicator for that. I was in two minds about it before I got to the turn (hence why I approached the turn with caution). I saw no other road signs on the road to say any restriction so thought it was ok. Once I had made the turn, I realised the reason why they wouldn’t have no entry signs on the front as you could turn left into the road coming from the other side of Lea Bridge Road.

I’ve passed the road again since and do see the no right turn signs. I’m unable to articulate properly why I find them unambiguous. Possibly as they blend in a bit with the shop signs in the area? The signs are quite small? I wish they placed at the actual corner of that junction. I will make representations in the hope they don’t offer the discount however am stuck as to what to dispute since I see the signs, even though (to me) they seem ambiguous.