ribonucleotide wrote:
Thank you, Richard, this is a useful advice.

You're welcome. Another piece of advice: I've just gone into
uk.transport.london to read any new messages, and am faced with four of
them from you with no indication of which messages you are replying to,
except that you included my name in one of them. Please quote
sufficient context of the message you are replying to, as many of us use
newsreaders which don't display the messages in the same way as Google
Groups.
--
Richard J.
(to e-mail me, swap uk and yon in address)