My first search of the attic has revealed I have more longer pieces, and fewer shorter. They are all roughly 1 inch (2.5 cm) in width, and recessed to take the base of the figure.
I have:
6 x single figure bases (2.75 inch, 7cm). These are ideal for 30mm mounted or 54 mm foot
2 x 6 inches (15cm)
1 x 7.5 inches (19cm)
4 x 9 inches (23cm)
and 3 x 12 inches (30cm)
but I may well find more in time. Porthos, you have first call. Anything you don't need, it's first come, first served. The cost will be one Standard BFFS Currency Unit, which is the promise of a beer if and when we meet. I'm just glad to get rid of them.