Competition between R.A.F. Halton and The London Clubs in 1927

The Alwyn Greenhalgh album from whence these photographs come states that the occasion was at Halton BUT from an article written by Noel Barker it seems possible that the venue was Wimbledon Common. Would The Royal Air Force ever have allowed the grass to become so unkempt?
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There are numerous well known enthusiasts in this picture. Alwyn Greenhalgh supplied a separate overlay to aid identification
Somewhere in the above picture you can find the following Aeromodellers!
1. Mr. H.T. Jackson of Watford, 2. Ralph Bullock. 3. Mr. T. H. Newell, 4. Geoff Barker, 5. Noel Barker, 6. Mr. S. C. Hersome, 7. Mr. Richard Langley, 8. S. G. Mullins, 9. Mrs Mullins, 10. B. K. Johnson BSc, 11. Mr. W. Plater (Halton), 12. D A Pavely, 12a. Mrs. D A Pavely (?)

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Click on this photograph to aid identification!
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One of the Halton contingent launches his aircraft. One or two more well known figures in this picture!
Somewhere in the above picture are:-
13. Capt. T. Neville, 15. J. E. Pelly-Fry, (A) Philip Barker (brother of Noel Barker), (B) Mr. Barker Senior (Of whom Noel Barker says "Bless him - He never actually built a model but was always very keen to take us (years ago) when we wanted to fly our models"
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Click on the picture to help you identify them!