TT, i'm well aware that american fuel isn't good enough to run lean burn mode
Exactly - but if you read most interweb sites - they don't even know the nitty gritty detail of lean burn.
But you just can not yet admit to yourself, and state
'lean burn mode is completely DISABLED in North American cars'!
but saying american tuners don't include lean burn mode for EU based cars is wrong
No it isn't. Like I said, there was some blatant BS from one of those US tuners, who stupidly stated he could get hold of 'British' VW maps - yet when questioned about is numpty claims, fcuked off and was never seen again to 'fight his corner'.

At the end of the day, US tuners develop their maps for their own market - their own fuels, their own lower quality oils, their own driving styles (which generally include an auto gearbox), and their own environmental conditions. And let us just 'pretend' for one minute that they
can get hold of an EU map - they certainly can NOT get hold of UK/EU fuels, and they can NOT consider UK/EU driving styles or environmental conditions.
I'm not going to quote from what was said exactly because i can't be bothered doing a search
What else can you 'not be bothered' to correctly research!

but I remember it being said on here some months ago that Regal used their own car (demo RSS) for the development of Giac UK software and they didn't modify the lean burn part of the file, why would they need to?
Erm, Regal used the GIAC software purely as a development for their racing car - not road car (in the same racing series which Superchips tried to claim they were the only permitted ECU tuner!

). Race cars have considerably different needs and requirements compared to road cars. And if 'Regal' then redeveloped the GIAC software, then it is no longer 'GIAC' is it!

Awesome work very closely with APR in house with their software development so who does that leave?
As with Regal, if Awesome fiddle with the APR codes, then it aint APR, it is an Awsome code.
Stick with someone like Revo, who have a substantial 'Revo-owned' R&D facility here in Blighty, who have unrestricted access to proper EU cars (and not just an EU map on a US car - which would be the best possible scenario - even if the yanks could overcome the immobilser lock), British fuel, FSI-specific engine oils, British weather, and British driving habits.