Thanks Rob!
So it is back to the GUVs. The BR models underframes just came as a set of etches. You can get a set of castings from MMP for a reasonable price and these have been supplemented with a few items from JLTRT such as the regulators and buffer beam pipe work. I had to scratch up some of the mounting points and framework, and also made up a representation of the brake rodding. Interestingly the BR ones took about three quarters of the time of the MMP one - which is a lot more comprehensive, but not as much a difference in time as I expected.
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There is a substantial casting for the hook in the MMP kit, but I was not comfortable with a white metal hook. Having time to think about it, I cut a slot down the centre of the tapered section and soldered in with 100 degree solder a CPL coupling hook.
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