The only explanation I could find for Tyrrell’s absence was this short snippet in Autosport
for 7th September:
Ken Tyrrell will not be fielding a car for Jackie Stewart in the October Brands F1 race, as after the American Grand Prix the Tyrrell team will be fully occupied with building the new 007 car for 1973.
Sounds a pretty feeble excuse to me, but interesting that at that stage the next Tyrrell was designated 007 and not 006/2 as it eventually became.
While flicking through Autosport
I came across these snippets relating to the race:
After the BARC had performed a superb job in organising the massive three-day international meeting at Brands Hatch last Sunday, clerk of the course Grahame White had to perform another unexpected duty at the end of the meeting, when someone stole his Lotus Europa course car. Grahame, noticing the Europa disappearing through South Bank Bend, jumped into a Cortina and caught up with the Europa. Grahame managed to catch the offender up and force him into the ditch, but when the offender was brought back to the pits for police questioning, he ran away, but was later recaptured in a Brands Hatch bar. Earlier in the day the same person had forced his way on to the back of the Brands Hatch Capri for a lap of honour with Frank Gardner after Gardner had won the Wiggins Teape Paperchase. What odd duties race organisers have to perform nowadays ...
Only 15,000 people turned out to watch last weekend’s big BARC-organised race meeting at Brands Hatch. The weather was, of course, a main hazard, but the entertainment in all races was superb. Many people missed an excellent meeting.
However, this sort of attendance cannot justify the amount of expense involved in promoting the meeting. MCD’s John Webb said on Tuesday: “I think there is going to have to be a savage reduction in the number of expensive meetings because the spectators can’t afford to pay for them”.
This was with basic admission being 50p on Friday and Saturday and a whopping £1.50 on the Sunday. I remember that as an impecunious student I decided that the expense of travel and admission fees was too great for me, so had to give it a miss. It does explain why the event was never repeated.