Robert Lawrie entry is an interesting case! I would say to obtain an entry was not easy. He & his co driver were both over 50yrs old.
He got to know members of the organising club through a mutual interest in climbing, he had always had fast cars but had never raced,- but this was pre WW2.
He had always expressed an interest to enter Le Mans, so after the war when he met up with the club members he had asked if the race was to be re held, at first he was told no, but later
that there would be a race. Apparently because he had been so enthusiastic & encouraged the club they wrote to invite him to compete if he provided a suitable car and that if he was not
fast enough & able to do suitable times that he would retire gracefully like a gentleman!
He went to the 1948 Motor Show to buy an Aston DB1 & Astons took some persuasion to believe him, but eventually convinced by his story they built him a car.
Meanwhile he had gone to the RAC to obtain his competition licence & was refused it.
He related the refusal to his French friends who apparently then answered to the RAC that if Lawrie did not race then no other British driver would be accepted.
The bluff worked & Lawrie got his licence never having done any motoring competition.
He had a team of friends, climbers & college friends who helped prepare the car & acted as pit crew, because he finished in 1949 in the Aston he qualified to enter the next year which he did
with a Riley RM Roadster 2.5L. reg AEN10. Again he finished & for the next year bought & entered the Jaguar XKL120 reg AEN546, again he finished & entered for 1952, but Peter Morgan asked him if he would drive the Morgan, (they could not get an entry) but it had been poorly prepared & did not last.
He told me he wished he had never agreed to it & should have used the XK.
Interesting man who had lots of momentoes, photos of the circuit just post war with all the war damage.. He made climbing boots & for expeditions & had part of Antarctica named after him.
The Riley, Aston and XK survived (which I owned), I am unsure about the Morgan.