There is a lot of opinion on forums, online and magazines onto topic of registration. It can be very confusing but I have finally got to the bottom of it all with the DVLA directly and some help from Stuart of the 289 Register. Please note that this page was put together in September 2017 so always good to check current legislation with the DVLA.
Our plan is to 'Correctly' register our car as a Hawk.
Here's how it will work for us.
1: We will use 2 major components from our 1951 AC Saloon donor car. In our case this will be the Engine and Transmission.
It could also have been suspension, steering assembly, rear axel or front axel.
2: We use the Hawk chassis and body kit as it is a kit from a kit car manufacturer.
3: The kit car has to go through the IVA test and then it can be registered.
4: The V5 of the AC Saloon is surrendered and the identity of the donor car ceases. This is replaced with a V5 for the kit car with an age related plate assigned to it. In our case, this will be a 1951 number plate.
5: The cars taxation class will be LPG with is MOT exempt for 3 years.
6: When applying for registration additional information may be required to support the application like an age verification certificate.
Extract form DVLA guide
7: You will also have to supply a built up vehicle report. It is provided here as a download.