I was just being a bit dull, I'm afraid - I've had a read of the psql help,
and by default it connects to port 5432, which is the port that's listening
for the PG 8.1.4 install on my server. I ran 'bin/psql -p 5555' instead, to
point at my PG 9.0 instance, and the pg_start_backup worked fine.
Thanks to all!
Dan
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