AndreaC wrote:
I'm about to start a new job and this will involve travelling from
Hounslow to Warren Street.

If I use the train it's a simple case of going to Waterloo and then up
on the Northern line, but I'll also have the option of using the tube.
The most obvious route there seems to be Piccadilly line to Green Park,
change to the Victoria line there and go on to Warren Street.

However, I seem to recall that once, a long time ago, in the vague
mists of time I tried to change or possibly even exit at Green Park and
it was a flipping horrible station to navigate.

The alternative as I see it is to stay with the Piccadilly line to
Leicester Sq and then change to the Northern line there.

Any suggestions or advice from those of you who know these things
better than me? Any idea of journey times?

You could take the train from Hounslow to Vauxhall and pick up the
Victoria line there to Warren Street.

Patrick