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Thruxton scrutineering bay has a proper weighbridge.
Have a word with the guys from the motorsport centre, I reckon they'll laugh but they should let you on them :)
Unfortunately I no longer have a contact there so can't as ask for you.
You can just transfer it to your car for £80, as by the sounds of it putting it on retention isn't what you want to do.
I've just done this although I went down to the local DVLA office to pay/check docs and the new V5 docs came back within 7 days...