The music is "Master of the Universe" from 1971, and EMI administer all Hawkwind from this era. It's quite possible that Dave Brock wasn't consulted, or even informed, when Ford's advertising agency showed interest in using it.
I imagine that EMI granted a licence for use in the same routine way that "Silver Machine" is allowed to appear on countless 70s pop compilations and rock collections!
Hawkwind have a long way to go before they catch up with Lemmy of Motorhead, who often makes personal appearances in ads. Lager, insurance and KitKat come to mind there.