Book  (1937)  
 
p76.  Harry H. Hazlewood.  Some Better Roses 1930-1936
McGredy's Yellow; A garden Rose with vigorous growth and most attractive blooms.

p122.  Mr. Frank Penn, Auckland, N.Z. Some Gems Among the New Roses. 
Among Roses of recent introduction, McGredy's Yellow is fast becoming popular. It is probably the best yellow introduced for some years past. Though rather lacking in substance, the blooms are of excellent form and the growth is vigorous.
Occasionally one gets really tip-top exhibition blooms.

Book  (1936)  Page(s) 440.  
 
McGredy's Yellow (HT) McGredy 1929; glossy butter-yellow, shaded golden-yellow, large, 3/4-full, cup form, high-centered, lasting, fragrance 5/10, floriferous, autumn-bloomer, long strong stems, growth 7/10, upright. Sangerhausen

Book  (1936)  Page(s) 575.  
 
Portadown Yellow (HT) McGredy 1927; chrome-yellow, base shaded golden-yellow, medium size, double, fine form, fragrance 5710, beautiful buds, good foliage, growth 6/10, well-branched. = Portadown Glow?

Book  (1934)  Page(s) 26.  
 
Harry H. Hazlewood.  The New Roses of 1934. 
Next in order of merit is McGredy's Yellow, a canary yellow of 25 to 30 petals fading to almost white.  The raiser describes it as the "best yellow", but this would not be supported here on present performances.

Website/Catalog  (1934)  Page(s) 35.  
 
New Roses 1934.  McGredy's Yellow (HT.  S. McGredy & Son 1933) Large, bright buttercup yellow flowers of perfect form and sweetly scented. Unlike most yellows, it is a strong grower. The growth is upright and disease free, while the foliage is large, glossy, dark bronzy green on dark red stems reminding one of a Barberry. Described by the raiser as the best yellow.​4/- each.
A Pernetiana variety with the colour fading to almost white in summer. Medium growth and rather weak foliage, 30 petals.
 

Book  (1932)  Page(s) 172.  
 
...1931 awards at the National Rose Society's Test Garden at Hayward Heath. 
First Class Trial-Ground Cerificate.
Oonagh Anderson, HT., ( S . McGredy & Son , Portadown ); W. A. Bilney (HT., W. Easlea & Sons, Eastwood, Essex); Patrick C. Bruce, HT., McGredy's Yellow, and Fred Walter, HT., (S. McGredy & Son, Portadown); ...Nypels Perfection, H. Poly., ( M. Leenders & Co., SteylTegelen, Holland ) ; Annie Brandt , HT., (H. Guillot  Saint - Marcellin, Isère, France .