Most places have gone indoors now. Broxtowe run indoors on a Saturday night now and they also run the snowman series outdoors over the winter,check their web site for details.
On a Wednesday the nearest one I know is Mansfield. They race all throught the year indoors I think.
There's a club at don valley stadium on a Friday but its not the best club around.
Batley do a winter series which is supposed to be good,never been myself.
West Bridgford run on a Friday night indoors,and they're also doing a short winter series all day on certain Saturdays.
Have a look round on the club section here on o0ple