one comment though, Martin (the author of the article) is more familiar with the Scottish grass track scene than he is with the English races. Points races, pursuits and team pursuits are in fact very unusual races on the grass track. Scratch races, elimination races, sprints and handicap races work much better on grass tracks and are the races that are most commonly held.
For anyone interested in setting up a grass track there is a useful section in this pdf DOCUMENT
which was produced by British Cycling a few years ago.
(Incidentally, the picture in that document of 4 riders going round a bend is of Victoria Pendleton, several years before she became World Sprint Champion. Vicki's father is an ex-national grass track champion and Vicki started her cycling career on grass tracks