saw this in magazine thought it might help someone

To Register Your Trike
This may sound an odd thing to consider before you have chosen to build your trike.
But decisions at this stage will determine the final outcome.
The m.s.v.a’s responsibility for registering you pride and joy have a set rules on which there are 3 options open to a private builder.
Option 1 - If you build your trike utilising a selection of second hand parts from a variety of donor vehicles your trike will be assigned a ‘Q’ plated registration. This signifies the trike is of in determination origin i.e. It has not been created from a single donor or made from brand new comports once a ‘Q’ plate has been assigned it CANNOT be transferred.
Option 2 - A current registration mark i.e. ‘58’ plate. This is only possible if you can prove that your trike is made from 100% brand new components. Currently there is 1 relaxation under this ruling for amateur builders. 1 major component is allowed to be reconditioned to an as new condition. Such a registration mark can be replaced by a private plate, providing the trike is not made to look younger (or newer). This is the same rules for production of a brand new car.
Option 3 - If your trike has been built using a pre determine number of major components from 1 vehicle. I.e. the donor vehicle. The registration assigned will be the same prefixed as that donor vehicle. For example if you build a trike using a set number of major components from a reliant on a ‘H’ plate your trike will also be assigned an ‘H’ plate. Again this can be changed to a private number plate providing the trike is NOT made to look younger.
Now you see the importance of where and how you obtain the components to build your trike. It is now pretty clear why keeping good records during a trike build is imperative, with this in mind purchase a very large ring binder and from day one, use it as a depository for everything to do with your project
I.e. Receipts, Technical data, photographs (to prove you are the builder).
In fact EVERY SINGLE PIECE OF PAPER YOU RECEIVE DURING THE BUILD. It will increase the desirability and registration of your trike.
Should you ever decide to sell it will increase your ability to sell easily as all this will show the prospective buyer how organised the build was.
gaz