^^^^ A touch expensive!
I'd PM Eddie-NL, a member on here who offers a retro fitting service. Give him this list and ask him if he can help you out. He's not a million miles from you and well worth the trip.
The RNS units are on here (in the For Sale section) a fair bit, look for the Version C and above (the LED screen ones), they sell for around £400+ depending on the Version. Use that as a price guide and look on eBay too, make sure it comes with its security code. You'll also need a GPS antenna and FAKRA antenna adapter, cost peanuts on eBay.
One in the For Sale section (with Gateway). Nowt to do with me......
~~ Clicky here ~~Cruise control stalks go for around £50+ on eBay. Ed supplies these and also supplies and fits these for less than £100. Ed can also supply and fit a new Can Gateway if ones needed.
Ed.....
~~ Clicky here ~~If your cars a DSG then MFSW buttons are an easy add on, if its a manual then it can't be done.
Fitting of all this lot is straight forward (if you know what your doing). Personally I leave these thing to the experts, there's a few on here luckily enough.