Apart from Lewar doew anybody know where I can get either a whole unit are components to build a pedestal table. The sort to fit around two tubular sections and hinge down.
KJ Howells sell various legs/supports bits as well as various table tops to put on the top. You can choose the pedestal, and top to suit from their catalogue.
Of course if its a particular pedestal you want, you could buy that somewhere else and have a look at the Howells table tops. We have one in our cockpit and are very pleased.
I am not sure that you mean a 'Pedestal Table' at all. Do you mean the sort of table that fits on the vertical bars that are often fitted either side of the wheel pedestal? You can just see our table in its folded position in front of the wheel binnacle in this picture: