Does the insurance database list it as a red hunter ?
It's possible that the registration has been sold onto a modern car ??
I think DVLA requires a vehicle/registration combination, which won't work if you don't know the vehicle make.
Alternatively, whoever has the bike has it added to their insurance policy for fire and theft purposes.
However, I was of the opinion that your insurance is void if the vehicle has no valid MOT ?
John "Josh" Nashwebmaster@arielownersmcc.co.uk
2009 royal Enfield,1978 t140 bonneville, '67 CJ750, 196-ish Ural M62 outfit, 1960 k750, ''51 kH500, ''49 soon to be Ariel bobber, 47 VH twinport, '44 Ariel WNG, '43 Ariel WNG, '41 Ariel WNG and piles of rusty scrap ....