Hi Andy,
Glad to see that your 131 is at last ready for you to take. That didn't take long did it?

I'm sorry to say though that I think it highly unlikely that you'll be able to get the car registered for UK use in time for use on the 3MA. I have registered two cars that I have imported from mainland Europe and in both cases the new registration number notification and number plate authorisation forms have been posted out to me some four to five working days after I had taken the forms to my local DVLO.?

Then of course there's the dreaded MoT, which you must have before you can even think of starting this process and, in my experience at least, there is usually something that means it will fail first time - although you might be lucky.
Sorry to be the bearer of sad news but I think that we should be realistic.
The temporary plates that Kevin is speaking of are usually provided by the seller and are certainly available in German, although you can't get them in Italy. I have no idea about Belgium I'm afraid but it's got to be worth speaking to Guy Moerenhout as, lets face it, it's got to be his fault his the car is so 'late'.

Best of luck to you and I hope for a successful conclusion in the next day or two.

Simon