I don't - but I suppose you could.... But why would you need a servo? A Minor is a small light car - and a servo doesn't improve the brakes. So if they are not working - better to find out why, rather than worry about a servo....
I bought my car out 5 months ago on ebay and it had no brakes when i asked the seller why they had been disconnected he said that it was to prevent them sticking, also all the piping had been cut to get at the floor as this has been completely replaced and re welded. This servo was fixed in the engine bay which I'm in the process of refurbishing, I wondered if this was needed to get the brakes sorted as the existing ones are drums I think....
A servo isn't totally necessery in a Minor as it only assists with braking. I had one fitted but took it out as it never gave a firm pedal but others use them and they seem quite happy - so it will be personal choice. If you use the servo it has to sit at a slight angle to work and bleed properly and you should plumb the whole system through the servo which means blocking off one of the master cylinder outlets(usually the rear outlet).