Just make sure they don't get too fat before tupping - even if they do get in lamb, you are asking for trouble lambing fat ewes, stuck lambs, prolapse - all of these things seem to occur in ewes that are overfat more than slim ewes.
I certainly wouldn't feed them any hard feed this year and depending on condition, I might restrict their grass until a few weeks prior to tupping, when Id flush them as per usual. I would say condition score 2.5 maximum at tupping, and it won't hurt if they are 2. Others seem to favour 3, but I think its going a bit far.