In the late seventies/early eighties quite a few meetings were held at Mildenhall during the winter months, They were mainly team matches and I recall that on more than one occasion Mildenhall had 2 matches Each time with 7 different riders) against opposition from teams that included Wimbledon, Swindon, Iwade etc. Very few of the riders had a regular summer time team place but went on to do this. One name that springs to mind is Kelvin Tatum riding for Wimbledon.
there was no charge for entry - just a small fee if you wanted a basic race card.