Peter, you can get them on Ebay UK:
http://www.ebay.co.uk/itm/Lucas-37420-7 ... 0986677852
I ended up buying a couple of these from Ebay Australia, they are very well made-just not labelled Lucas;
http://www.ebay.com.au/itm/OZsell-TOP-Q ... 1163656591?
Cheers
Dave

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Your imagination is only limited by the size of your wallet
"61 850 original and crusty (Mavis)
"64 Smooth Roof Van (Colin)
"67 Deluxe resto project (Monty)

did mine ages ago 6 fuses to 6 relays, with an accessory switched 8 fuses
1 low beam 4 accessories ------------- A indicators D horn & interior lamp G
2 high beam 5 ignition B lights E wipers & washer H
3 driving lights 6 radiator fan C stereo F hazards

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1969 Blue Mini K, 1330cc, Weber 45, polished aluminum roll cage, Race seats, 4 point harness, full rewire incorporating 8 fuses, 6 relays and new headlights just needs tyres front shocks and a windscreen til re-register

Thanks Dave.

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1967 Cooper S - new front bearings to do.
1965 Cooper S shell - Slow progress. No time or money!
1966 Deluxe- next rustoration!
Mk 2 & XJ6 Jags. Less said the better.