Hi Paul, I run with the fast group, and am a firm believer in turn-backs at regular intervals.
This was a courtesy taught to me by Graham Morson (When I first joined the club and I was often the last person), and I've always tried to promote it since.
Though a few do stand talking

at the turn-back, most do return to the last runner to collect them up.
As for running in unknown territory, again, most of the routes will soon become familiar, especially Brown Edge week after week after week etc in the winter months, and as stated, we always re-group so no one falls behind.
Onto your advert on your back, most of the routes this time of year take in the fells, so only Flossy the sheep will see that on Combes Moss!!
Don't worry, you'll be fine!!
Cheers, Nigel