Frank 4x4 has a luggage strap version which is an elegant fix. He'll be along when he recovers from Newmarket......
True to form Dave

- Here is my version (which is similar to the Simmonds version but home made) But I made mine first.

Working Drawing. Check the length between the top lugs on your Rack because we are on our second rack and they differ. Adjust the length accordingly. The aluminium strip is sandwiched inside the doubled old lap top strap which is stitched along the edges (sewing machine stitched).
The Lamp is a swivel lamp sourced on ebay for £8. The 'Y Splitter was made for me by M.E.S Ltd in Warwick who make the Morgan Electrical Harnesses (01926 499756) It fits in the uncoupled connector on the existing lamp and the free end is held to the wood frame by the spare wheel on a strip of Velcro. Other piece of Velcro is wrapped around the high level lamps socket (also supplied to me by M.E.S.

In Situ on our Suitcase.
It gives a sense of comfort when a very large truck is right on your back end.