I put the T board boot floppy in and it booted to TOS2 and the hard drive was detected and seems to be intact.
4Mb of RAM is working and plugging the mouse a few times has removed some oxidisation from the pins so it is working more reliably.
The screen is still flickering badly and is blurred. I think the socket may have worked loose from the pcb and may have to be re-soldered. Can it just be soldered under the board ?