If there is anyone out there in the Leeds area with a Mk7 3-door, Lockwood would be delighted if you could call in, so they could make templates.
Lockwood state this on their website. Makes me laugh. I mean how difficult is it to get access to a Golf 3 dr to measure up. They could just have one on a test drive and do the necessary. 
I guess they go on demand for a lot of things and maybe there's not enough demand for 3 door Golfs.
To get one on a test drive they'd have to pay a staff member to book an appointment, get the car minus bloke in corporate tie on an unaccompanied test drive, bring it to their HQ, measure, cut, trial fit, make program for laser cutters or whatever they use. Fit a prototype retail version, remove 3M tape, clean up, take car back, pay member of staff to listen to sales persons horsepoop about finance etc etc before staff member can escape their clutches...
It'd be easier to hire a 3 door for a day but I'll bet there won't be many, if any 3 door hire Golfs in the UK.
When I had my 3 door GTI nobody except VW did sill protectors for it.
Once I changed to a five door car (as one does) there was a stack of choices.
I went for RGM black plastic ones as a) they were cheap b) the black contrasts with the white and c) Sootchucker had some and they looked good in his photos.
Am I happy with them? They do the job
Do I have a load of nice detailed photos and a mini review? No (but Sootchucker does!)