That is pretty big! That's quick even with 300 lol £500 for 70bhp isn't to shabby either.I've had to keep it secret until now, but SEAT have now confirmed the ST R will be tunable in the UK to 370 HP and retain warranty. I've updated the article: https://www.seatcupra.net/index.php/2019/03/11/new-leon-cupra-r-st-details-and-video/
This is big news for SEAT and CUPRA and hopefully paves the way for approved remaps going forward. Something UK fans have wanted for years.