Got a price of €454/£380 to have the VW rear parking sensors retro fitted by the dealer, is it worth it? or shall I go for another brand around 50% less?
You mean like this

Laserline, the best outside OEM. Contact Laserline and they'll put you in touch with a local fitter. I would guess up to £300 fitted?
I fitted these myself, bought a brand new set off ebay for only £25

They come in at around £125 normally.
Quite a skilled job (I worked in F1 & Aircraft) would recommend you get a fitter. I'm really pleased with result & reckon they look near as damn it original, but they do not display on RNS510 screen, just audible bleeper.
