@jens2go
The hunter-gatherer label isn't really that accurate sometimes. Its not like societies went to bed one night as hunter gatherers then woke up the next day as farmers.
In late Mesolithic to early Neolithic Britain there was likely a lot of interplay between the two ways of subsisting, with hunting, gathering and small scale localised farming with things like transhumance being practiced alongside each other.
A tendency towards more settled agriculture may have taken hundreds of years.