Nitrogen filled tyres

[FZP]

Hi all,
I've ordered some MPSS tyres for my car and the supplier uses Nitrogen exclusively. Is this readily available at filling stations around the country should I need it?

Secondly, they suggested that as an emergency I could top up with air and then I could go back and they would empty them and refill again.

Any thoughts on the above points and are there any real world benefits of using nitrogen when not on the track.

Cheers

[FZP]

Thought as much given that the likelihood of them removing the air from the tyre prior to re inflation is very low. I was of the opinion that it was marketing guff at very best prior to posting. Was just curious if there was something I had missed.
Looks like I'll be eating lettuce and tweaking aero to optimise my coffee run in the mornings. Looking forward to the arrival of Michelin Pilot Super Sports for the next track day. Will be interesting to compare against the PS2's.