If you have a CoC and, equally as important, have owned the vehicle prior to Brexit, 01/01/2021. You will have a certain procedure to follow as if, prior to Brexit procedure. If not, you will have to undergo vehicle examination and pay all import taxes and VAT.

I had exactly the same issue on my defender 110 XS, I had it done and would recommend Peter Cripps at Ravensthorpe service station NN68EH. I had a new clutch installed at the time too. 49000 miles.