Britons are turning to the coast for their summer holidays, with Cornwall emerging as the UK's most-searched coastal staycation destination.The popular county has racked up 6,377 searches over the past two weeks, according to new data, putting it comfortably ahead of other British seaside favourites, including Brighton and Bournemouth.Travel discovery site Rome2Rio analysed internal data to find the most popular British staycations. It looked at…