| Hi Gaz
in 2020 there will be 7 rounds all run with NGRRC I don't think the entry costs for next season are available yet but this year each race day cost either £120 or £140 so £240 to £280 for the race weekend, most if not all race weekends will have a Friday testday for around £120 for which you should get at least 6 sessions and often 7
There are a few bikes available I have both a 600SS Class B bike for sale and a 620SS Class A bike also for sale
There is a Desmo Due paddock page on facebook where you will find most of the riders and is a good place to ask questions
Kevin
Checkout the Desmo Due Paddock on Facebook | 
skidlids
Threaded Mode