................

Further to all of this I don't have possession of the drive so I cannot
take a second closer look at it.

On reading this page: http://www.drivesolutions.com/info/aboutlaptop.shtml
I realise it might have an adaptor already attached which could be
easily removed.

However it did look like it might have one of these:
http://www.ebay.com/itm/Toshiba-Hard...-/130596347842
(also linked earlier - PCB Controller Card Board)

This would be a bigger problem as it would not have an adapter and I'd
need to be looking for a working Toshiba laptop of a similar age to
access the contents of the disk.

Not looking good.