Book  (1963)  Page(s) 144.  Includes photo(s).
 
Lady Sonia (shrub) 'Grandmaster' x 'Doreen'.  Raised by John Mattock.  Trial Ground Certificate and Certificate of Merit 1961. 

Book  (1962)  Page(s) 158.  
 

Trial Ground Awards 1961  
Certificate of Merit to Lady Sonia (Shrub). Trial Ground No.  C.151.  Reg. No. 668. Raiser and Distributor: John Mattock,  Oxford.   'Grandmaster' x 'Doreen'.  Vigour  of growth, 9. Habit of growth upright and branching, 9. Freedom from disease, 14.    Blooms of 20 petals, 4 to 4 1/2 inches across when  open,  8.  Colour deep  buttercup-yellow, 7.  Freedom   of flowering, 15.   General effect, 5. Fragrance, 3. 

Book  (1961)  Page(s) 161.  
 
Show Awards and Trial Ground Awards 1960 
Trial Ground Certificate   Lady Sonia  (shrub) Trial Ground No. C.151. Reg No. 668. Raiser and Distributor: John Mattock, Oxford. 'Grandmaster' x 'Doreen'. Vigour of growth 9. Habit of growth upright and branching 9. Freedom from disease 14. Blooms semi-double (20 petals), 4 to 4 1/2 inches across when open 8. Colour Deep Golden Yellow 7. Freedom of flowering 15. General effect 5. Fragrance 3.