Britons may be given a brief glimmer of sunshine this weekend before the gates once again open to the misery of the Atlantic. While some forecasters cling to a fading hope of any summer this year, others have submitted to a ‘pessimistic’ outlook. Weeks of rain and sub-par temperatures will give way on Sunday to a 23C burst of joy for the England-Spain game. But most weather forecasting models then predict a return to cloudy skies, grim temperatures and rain. Met Office meteorologist Aidan McGivern said: “Heading into the weekend, higher pressure is to the north and extending a ridge over the U…