I used to often got to Crawley for work, if it was not the M25 then it would be the M3 / M25 junction that held you up.
Seldom could I go all the way without a major holdup, sometimes used to go back home via Guilford / Hogs Back, lovely road in the summer.
How about doing overnight deliveries? - might be a viable way of continuing to deliver bikes, but the hours might not be attractive to everyone.
Lucky to live down here in Somerset, gets congested sometime but pretty good most of the time.