Im looking for a place that sells weld on ally fittings for header tanks/washer bottles. Filler caps and necks and the small pipes for the hoses etc...
Speedflow.co.uk, Paceproducts, Rally design, Thinkautomotive. Paceproducts sell the Ford (modern?) style rad necks alongside tradtional caps and necks. ProAlloy have a similar product line but do their own caps in black plastic instead of Ford idiot yellow.
Ally tube is typically a LOT cheaper from a stockholder but obviously comes in longer lengths than 'by the metre' and you'll need to able to do the hose retention beads yourself. Still, a 5m length is often cheaper than the £/m although there are a few odd sizes ocasionally used for intercooler stuff that aren't commercially available i.e. the extrusion dies were custom made