Generally if you already have a V5 you should be ok. You can change the engine number and the body on the V5 and still retain it (I wouldn't recommend doing both at the same time).
For people who have no V5 you want your car to be classified as a "reconstructed classic", this means a full vehicle inspection (for an Motorcycle Single Vehicle Approval, MVSA) is NOT required. If you have a mix of modern parts then you would get a Q plate and need an inspection a you have effectively created a new model of car.
You can phone the DVLA and ask them, they may need photos and a letter from the Austin Seven club confirming: chassis, engine, gearbox, axles, suspension and steering are original from a given year. They will then allocate you a new VIN number which you will need to stamp on your car and have a local garage confirm this in writing. You will need to complete form V55/5 which effectively is all the detail that will go on the V5, you need to fill in every weight and dimension.
Pay them £55 and they will allocate an age related plate and your car will be classed as an Historic vehicle 19xx whatever year you give them. The car will be first registered the year you do all of the above.
I am going through this process now. Once you have spoken to DVLA and they class your car as a reconstructed classic they will send a letter with all the detail above and more.
I wasn't expecting to write that much!
For people who have no V5 you want your car to be classified as a "reconstructed classic", this means a full vehicle inspection (for an Motorcycle Single Vehicle Approval, MVSA) is NOT required. If you have a mix of modern parts then you would get a Q plate and need an inspection a you have effectively created a new model of car.
You can phone the DVLA and ask them, they may need photos and a letter from the Austin Seven club confirming: chassis, engine, gearbox, axles, suspension and steering are original from a given year. They will then allocate you a new VIN number which you will need to stamp on your car and have a local garage confirm this in writing. You will need to complete form V55/5 which effectively is all the detail that will go on the V5, you need to fill in every weight and dimension.
Pay them £55 and they will allocate an age related plate and your car will be classed as an Historic vehicle 19xx whatever year you give them. The car will be first registered the year you do all of the above.
I am going through this process now. Once you have spoken to DVLA and they class your car as a reconstructed classic they will send a letter with all the detail above and more.
I wasn't expecting to write that much!