Lpc2000

Nick,

> Can anyone confirm the voltage present on Tx.

out of reset, the TX pin is at 'low' level on my board
with the BSL jumper installed. 
If I then issue a "read device id" command from within
the LPC200 flash utility, theres some traffic on the line
and the utility reports the part id read successfully.
TX is high afterwards.
If I then reset the board again, TX goes back to low
and the next "Read device ID" fails, leaving TX in high
state.
The next "Read device ID" then is again successful, even
if ignoring the request to reset the board.

So, if your TX stays low, no matter what you do, I guess
you have a faulty board, either controller damaged, line
shortened or transceiver damaged.
I'd inspect the soldering to see if there are some shorts,
especially the "expansion" connector, that carries TXD0
next to GND.

hth
-uwe