Right so the remap is done and I've been driving it for 5 days. Mine is a 2.0 JTDm, and I believe it is the 136bhp.
Technician arrived in plenty of time at my workplace and got started promptly, I left the keys with him and it was done about 1.5 hours later. I went for a drive in it after it was done and it didn't really feel any different. I made it clear before the work was started that I don't want any of the side effects such as smoking, clutch slip, etc or I will request it changed back. So the extra power is definitely there. Delivery is still very smooth generally, although on 1st and 2nd a bit of a kick when turbo comes in. It's not a big kick in the teeth, but it's there. 1st and 2nd gear seem unrestricted now, and there is more power for the length of the rev range in 3rd with good pull. Technician said only 0.1bar extra boost on the map. Looking at it on paper, my improvement is 136bhp to 215bhp. It doesn't seem like 80 bhp of a power gain, but then maybe that's what 215bhp feels like I'm not sure.
I'd glad I haven't witnessed any side effects yet, the car never smoked at all before, and it still doesn't. EGR is not blanked but it's deleted from ECU. Apart from the pull you can't tell it's been mapped, and that's what I wanted.
Giving it a few more days, I'm really glad the extra power is there. For £295 I'm very happy with what I got. Wouldn't have paid any more though considering the difference.
Providing the condition of the car sticks, I'd highly recommend Celtic Tuning on the 2.0 diesels.