Thanks for all the responses. Here's what the engineer had to say:
Quote:
As I suggested the other day, there is no need for an engineering certificate for the engine or brakes, provided that the brakes are a factory configuration.
Odd as it might sound, the remote booster is a grey area in the rules. If I recall correctly, the disc brake mini didn't have a brake booster. The remote booster should theoretically require a certificate, but the RTA have never really been interested in requiring one where the single circuit brakes are otherwise a "standard" configuration, so it's not really an issue.
The engine and brakes would be mentioned on an engineering certificate even though they didn't need to be certified. In effect, you would only be paying for the certification of the seats.
Even though the vehicle pre-dates the ADRs, it does have to be certified for modified seats.
If you were to use original seat bases under the seats that are now fitted, and the seats were securely adapted to those bases, it would fall into a grey area in the rules such that they could be deemed to comply with the requirements. If you fit new seat bases, even if they were similar to the original ones, they would arguably have to comply with the current requirements and be secured at the back.
That (hopefully) sorts out the engine issues, I'm still undecided about what to do about the seats. I'd feel more comfortable making the anchor points safer, but it's all time and money...