You'll need to clock it and also Jabba grind out the exhaust manifold, you will also need;

Down Pipe £350
Manifold £500
440cc Injectors £225
3" MAF Tube £125
Oil Feed £35
Oil Return £35
Water Pipe £35
S3 Fuel Pump £200
Gaskets £40
Mapping £500
Boost Pipe £90
Turbo TIP £90

Thats all presuming you already have a large core intercooler, dump valve and cat back exhaust... I'd also possibly budget for a new clutch depending on mileage.