From reading many Battle of Britain autobiographies, it seems that after being 'temporarily unsure of position' following action the drill was to head to the coast, turn left or right (depending on base location) and follow until a known reference point where they could then head inland. Given you can't be further than 70 miles from the coast - and in many cases, much nearer for airfields - it was probably the safest way to let-down in bad weather.