Brake pipe replacement - which pipe size and fitting type?

[dogman]

Hi all,

Rascal just failed MOT, it needs the brake pipe replacing that runs from the the combination valve under the front bumper to the DSP valve halfway along the van.
The Haynes manual doesn't go into any detail about replacing brake pipes, does anyone know:
1. Which diameter copper pipe to use
2. Presumably male fittings are required at each end, but which fitting size and tpi is required?
3. Do both ends of the pipe require a double flare?

Any help is much appreciated,
Many thanks

Jon