In the mid 60s Bob Groves, and Bilbo had already imported real skateboards from the US - Hobies with laminated hardwood decks and proper cast metal trucks .Then Bilbo began to assemble them over here using US trucks and wheels , under the Hobie and Bilbo logos. These boards were only available in surf shops and were quite expensive.
The Warwicks were for sale in general sports shops across the country , and sold in their thousands. They had a plywood deck, inferior wheels and pressed metal sheet trucks. Many were also exported to Australia !
Finding a good condition Warwick now is hard but not impossible ; the Hobies and Bilbos are gold dust.
Thanks to Tony for some of this info.