I don’t think we are having another Chipped UK meet, well at least not this year as Matt is currently setting up a big meet at Courtenay to have a RR day and a look around / passenger ride in there supercharged Astra.
As for Live remaps to normal off the shelf map in cost is normally around £30 / 50 more.
I would be very choosy who does a remap, I would go back to chipped UK as Jayson really knew his stuff, and I would only go back to Bromsgrove HQ to have it done. Others that I would trust would be TMS, Courtenay’s, and Regal.
As for gains you are looking between 8 - 10 bhp and maybe the same in torque.