having got my 110 tdi back from the dealer (turbo wastegate repair and new boost valve), i am very happy with my new purchase. Plenty of power when needed, and if driven sensibly, nearly 55mpg. I would value opinions on which is best, a tuning box or remap. I can get a tuning box from various ebay shops, all with 100% positive feedback on over 2000 sales each. These range in cost from 85-180, or i can get a remap for 230. Is there a difference, is either likely to cause any damage long term??

Custom remap all the way mate. I think an ebay box might seem great when you install it, but what happens 6 months down the line? Some of them just alter the amount of fuel being pumped to the engine.

http://www.celtictuning.co.uk/Special%20Offers.aspx

Theyre national and cover Northern Ireland, but I dont know of any others. Pretty sure someone else could point you in the right direction.

Get a remap from Shark with the sts. Have a look in the group buy section, there's an offer currently running. By all accounts (although I don't have personal experience myself) you won't be disappointed.