Registering my G in the UK

You don't mention what type of G, a 461 or a 463?

Speedo just needs to show Miles. If it's a 463, 2004 model with the C-class instrumentation, then it's possible to change the all the readings from Km to miles and set the lower part of the display to constantly show speed in mph, rather than outside temperature. Go to the settings menu on the instrument cluster: a few button presses and it's done. (If your user manual is not in English, download and read the USA user manual on this forum). Headlights are something that an MOT station may or may not look at, but I think it's possible to find some VW Golf headlights that are identical to the non-Zenon versions, but for the UK.

You will also need to swap the wiring around on the rear reversing light and fog light. Best not not cut the existing wires, but to add another wire with the correct fast-on connector to extend the foglamp +ve signal from the exiting foglamp back to the passenger side and similarly, another wire to bring the reversing light signal from the existing lamp, back across to the driver's side. The ground wires can be left alone. Just connect the new extended wires to the lamps and swap the lenses around. This will take about 20 minutes.

On two occasions I found MOT stations to be more fussy about the rear lights than the headlights. The headlights in any case don't have a pronounced L/R fresnel lens part and it's hard to tell without the measuring equipment exactly where they point, so you may be OK with them.

If your new insurance asks for evidence of an immobiliser and or alarm (if fitted), I found that the MB UK customer services (actually based in Belgium) are very good at providing the necessary confirmation. The MB factory alarms conform to Thatcham Cat-1, with the usual MB ignition-key immobiliser:

"......I am able to confirm that your vehicle was fitted with an immobilser, together with an infrared ignition key system, as standard equipment and that the vehicle left the factory with a MBAAS MB alarm system, which is Thatcham category 1 approved....."

If you've imported it from an EC country, then the relevant type-approval information is already on the registration document and so you should not require anything else.

Otherwise you'll need to get a C of C document from MBUK, which I think they charge for, nowadays.

Information on how to decode the Euro registration documents is given here:

http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:1999:138:0057...

Good luck!

You also need the EEC Certificate of Conformity (yellow booklet that should have come with the vehicle).

I am assuming it is an EU vehicle.

If you have a copy of the previous European registration document (if it's EU), the European Type Approval should be on it and you will not require a CofC.

The headlamps are NOT switchable, so if your MOT station is insistant, you'll need to replace them with VW ones or UK G500 versions (you'll need either the part number or a G500 VIN for the dealer to order against.)

But you can get clear lense type VW ones (still no height adjustment) when you replace the whole mounting bracket from Ebay from goingfast_info for about £48/pair delivered.