Ok, thanks for the advice guys. I just checked my schedule and I'll be in the country for less than 60 days anyway, so worst ways my visa will be void and I'll only get a 30 day visa waiver (this is a bit annoying for me because I'll have to get an extension, but worse still get my tm30 stamped when I arrive, ready for the extension)
I should be (but not 💯%) using the business class immigration desks at Suvanabhumi (yes, this exists), and I always assume they are more lax there, although that's purely assumption, as I've never had ant real issues in over 30 entries to Thailand, touch wood, so I couldn't really differentiate between a strict and lax immigration experience.
Anyway, I'm just going to chance it, and incase anyone is interested I'll post a comment on this thread when I've passed immigration in a few weeks.
It is abit rubbish. I've had countless single, double and triple (when they were around) tourist visas over the years and never had this problem I even just checked my application form (I'd taken a photo of it) to double check it wasn't my mistake.