I have just bought some thule wingbars from roofracks.co.uk – they are also snowchains.co.uk.
£139 – I could really see anywhere cheaper.
Ordered yesterday and dispatched already via Fedex.
Also ordered a couple of Thule Proride 591s bike racks from Amazon to go on them – £50.35 each and free delivery (prime) – which seems by far the cheapest.
I don’t think getting a package from roofracks or roofbox was as cheap.
The Buzz Rack cycle rack looks interesting but obviously not lockable:
http://www.roofbox.co.uk/bargains-sale-clearance/bargains-bikeracks-returns.php
I didn’t go for a fork mount as some have limitations on carbon forks, or carbon forks with metal dropouts.