Transfers used on British Pottery

I am currently researching the makers of ceramic/enamel transfers as commonly seen on British pottery and glass, c.1930s to 1970s. One company I am particularly interested in is J.M. Gulliver, which may have been based in Stoke-on-Trent and was definitely in operation around 1950. But does anyone have further information that could help me? In particular a catalogue or advert would be of most interest.

So far I am aware of:

• Johnson, Matthey & Co. Ltd (then Matthey Printed Products)
  
• Ben Capper
  
• K.H. Bailey
  
• J.M. Gulliver

Johnson, Matthey (amongst others) also provided the gold that was used to gild products and was the largest company producing ceramic and glass decorations. It is also worth noting that there were many companies producing the enamel colours, but seemingly very few producing the transfers.

Hi try Hanley Library archives, they have the pottery and glass trade papers from about 1900 onwards on microfiche, always loads of adverts in those, I have several hard copies from the 1920's and they have similar ads in......

Many thanks for your help, I'll contact them this morning.