Maybe ask a mod to put this on to the Owner Operator forum?
A few thoughts though. Not a lot of tractor solo movement made so you may be waiting for a while. Those solo moves may be from dropping gen-sets or other specialist gear so may be using own account permits and not up for commercial work.
What sort of trailer is it? Could a haulier put his own pay load in it? Is it a UK trailer with a current mot and plating certs? Good tyres etc? Any one entering the UK with anything unusual can expect to attract the attention of the C & E, so many will shy away because of that.
What you’re thinking of isn’t impossible but ain’t all plain sailing.
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