Basically you are building a Clubsport (R engine without AWD)
You are UK based..so want ever you do you will have to inform DVLA as the engine capacity will not match the DVLA records..& insurance will be interesting also..
You will need a whole front end basically...& (rear brakes)
engine
gearbox
drivers side (UK) 2wd take off flange/drive shaft to replace AWD prop shaft take off box (between gearbox & drivers side drive shaft)
lower bumper oil cooler
lower DSG cooler if going DSG
wiring looms
ECU
Dash clocks
Whole braking package from R or GTi PP..or at least R rears & Porsche Macan fronts
Aluminium front hub carriers
New front struts,
New front wheel bearings
You don't state which "TSI" you have..so if it is a base model that has torsion beam rear you'll need a whole multi-link rear subframe/suspension also...
If you are having DSG then you have to fit the two aux coolers (which are in the two lower "R" ducts somewhere...if Manual gearbox, then just get a Mocal or VWRacing Aux cooler to sit in the central lower grill...
Access to someone who can perform component protection removal & key the alarm & make the electronics talk to each other instead of immobilising the whole car, also code out the AWD system.
Good Information.
Manual 1.4 TSI 122 2015.
Has the Multi-link suspension.