That'll be me then!
I can certainly supply a CD with a digital build manual for your Bulldog, but before you start to spend a lot of money and even more hours on the car, please tell me that the V5C you have with your car shows that it is registered as a Pilgrim Bulldog. Hopefully you know the registration number of the car, and if it starts with a "Q" then you have the go ahead to spend as much money and time on the car as you wish.
If not, then you have a problem.
If you would like to send me a private email, we can start to talk about it without repeating many old threads on this forum about the current regulations and how difficult it is to get a car not designed to meet them registered nowadays. I'm pretty certain that the Bulldog will not pass the current regulations without expensive modifications including a new, current regulation conformant engine.
If you are aware of all of this, or if you are building this just a project and you are not interested in registering it for the road, please still send me a private email with your full name and address and I will send you a CD by return.