With thanks to all for useful comments and diagrams.
Problem now overcome. I pass on comments from my friend and his mobile mechanic.
In the end the 2nd eBay m/c was installed and the system 'pedal pumped' bled with difficulty, the problem seeming to be that the particular m/c fitted to this 2012 car has a 'difficult to fill fluid reservoir'.
Getting brake fluid into the rear compartment of the 'baffled' reservoir was very difficult on a level driveway, car on jacks with all wheels off, also it is not easy to check the fluid level in the rear compartment.
Putting a thin rubber glove over the filling orifice and tapping the diaphragm with a finger helped to transfer fluid into the rear compartment. Very tedious, but solved the problem.
If the correct adaptor for the m/c cap had been available initially, pressure bleeding would have worked ok and the whole sorry mess would have been avoided.
Lessons learned! Thanks again to all.
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