Sorrry, the links don't seem to work.
Cruise control kit multi-function
Order number: 8E0054690
Our price: 24.15 GBP
plus 17.5% VAT
Cruise type column trim
Order number: 8E0953512P***
Our price: 18.98 GBP
plus 17.5% VAT
The cruise kit you mention does not have the steering control systems module (SCSM). VagParts also do a kit which does include this - at least they used to but I see it's no longer on their website - it might be worth giving them a call. The SCSM on its own is about £100, but the kit was the same price.
The only way to be certain whether you need a new SCSM is to scan your existing one (with, e.g. VagCom). Or I guess you could strip down the steering column and read the sticker on the side of it! But since you will need VagCom (or equivalent) to code the cruise control anyway, you might as well do it the easy way.
I found that phoning the dealer was no help - they told me the part number of what SCSM they thought ought to be in the car (based on what would be the current replacement) NOT what was actually in the car from when it was built. So, according to them I had SCSM "8E0 953 549 N", which is already cruise compatible, whereas I actually had SCSM "8E0 953 549 F", which isn't cruise compatible.
I ordered the complete cruise kit from VagParts (sorry, can't remember the kit "part" number) and it actually came with SCSM "8E0 953 549 P", but this did the job fine.
The cruise stalk part number is "4E0 953 521 4PK" and the screws to attach it to the column are "N 909 068 02", of which you need 2. As I said, you can get a kit with all these parts in for about the same cost as just the SCSM. The trim (that you already found) is not included.