jonny..
The IC is at the front, drivers side... infront of the wheel arch... remove the arch liner and you'll get into it...
First thing id do would be check the plugs... then compression.... then strip off the turbos to check....
When i did mine, plug No5 had melted....
I had two damged pistons, scored valves and one turbo without blades... Not good, nor cheap
If its blown turbos and piston etc damage id recommend Leon (JPS)... that where i sent my car to (used McKays transport company, 240 or so to get it to MiltonKeynes)
What happened when mine went - Was driving down the M90... quiet slowly, lost all power and started smoking... thought it was just a hose off as there was just a small chirp kinda noise... pulled over...nothing evidant.. Got the car home..... no turbo power and lots of smoke... car idled fine... got a 2nd hand set of j-spec turbo's fitted, car came back idleing like a bag of shit and with new turbos blown.... ACE sent it to Leon!