Also had delivered a few missing parts that I found on 105speed forums, these included a boot handle, a wiper motor, a pair of front indicator units and most importantly (and most difficult to find) a set of door locks and associated mechanisms. These all need a bit of TLC but as I am planning to colour code (paint all of the trim then that is fine.
In addition to the engine I have chatted to Caprisport about brakes and looks like the XR4x4 bits I bought (an ebay bargain) are the right ones and will fit my uprights and axle with significantly less outlay that I was budgeting. They sell through Ebay and so I will be ordering caliper bracket for their GTR260 kit and rear axle kit and then sourcing some RS Turbo front brake discs (rears I can use from the XR4x4). Another bonus is that the rear hubs will not need machining but the downside is the fronts will.
So a fairly busy week in terms of planning and sourcing some hard to find parts but I can now see a plan coming together where the engine, brakes and gearbox will work in harmony.