The Brexit negotiations are now at their halfway stage but, as any mountaineer knows, the hardest part of reaching the summit is the final, punishing ascent.

With most of the basic ‘housekeeping’ issues of the Brexit divorce deal now resolved, those charged with conducting the negotiations fully expect the second half of the process will be tougher than the first.

So here we look at the journey travelled so far… and the potentially arduous road that lies ahead.