Turns out I live near a steel wholesaler
http://www.fhbrundle.co.uk/groups/30__Steel_sectionsTheir 42.4mm OD 3mm wall pipe is perfect for 1 1/4" BSP plumbing and they have sizes for 1" BSP too.
7.6m of this pipe costs about £25 inc VAT (way cheaper than BSS) so the smaller stuff should be less.
If anyone wants me to bring some to the BBB give me a shout, if we can get enough people to warrant ordering 7.6m (they'll cut it up for transport) then I'd be happy to help.
