Collard and Collard were an English make that were dissolved in the 1930s I think, and the name was bought by Kemble.
The firm grew out of Clementi and Co, Clementi being the composer who was also a piano maker. His music, thankfully, is making something of a comeback on concert stages.
The firm became Collard and Collard on Clementi's death or shortly after, and the pianos were on a par with the Broadwood and Erard pianos of the time (1860s to about 1900).
Their early straight strung grands were very good, and I mean good in the world of early straight strung parlour and concert grand pianos (nothing like Steinways or other 'modern' type makers like Bechstein and Bluthner). Some were underdamped with the dampers being under the strings but most were over damped with the dampers sitting on top of the strings.
The modern type over strung grands they produced were actually not very good, and by this time they were producing a kind of up-market 'mass' produced 6' grand (as mass produced as mass produced was back then), but they were really not very well made. The soundboards were not the greatest quality and many of them have inverse crown now, and the actions were not the best quality. Whether or not one would make a good 'core' is not something I know, but it's not something I would do anyway.
Some of the uprights from the same period, however, were of exceptional quality, and there are many collard and collard pianos from 1900 to 1930ish that are in service, being enjoyed in peoples homes all over Britain. They were beautiful pianos.