Numbers are very much less this year sadly, Mixy saw a lot of them wiped out, hopefully will get out there again later in the year when it cools down a bit. Make sure you get some insurance sorted as well as the permissions, I use the Sporting shooters association which gives £2 million cover per incident for about 6 pence a day.
https://www.subscription.co.uk/secure/default.aspx?PUBC=SSA&PROM=SSABAR1
https://www.subscription.co.uk/secure/default.aspx?PUBC=SSA&PROM=SSABAR1