I've worked out that in total, there should be ticket capacity for 766,788 tickets based on the capacity of each stadium
Friday 7 June - Edinburgh, BT Murrayfield Stadium - 67,144 capacity
Saturday 8 June - Edinburgh, BT Murrayfield Stadium - 67,144 capacity
Friday 14 June - Liverpool, Anfield Stadium - 54,000 capacity
Saturday 15 June - Liverpool, Anfield Stadium - 54,000 capacity
Tuesday 18 June - Cardiff, Principality Stadium - 74,500 capacity
Friday 21 June - London, Wembley Stadium - 90,000 capacity
Saturday 22 June - London, Wembley Stadium - 90,000 capacity
Thursday 15 August - London, Wembley Stadium - 90,000 capacity
Friday 16 August - London, Wembley Stadium - 90,000 capacity
Saturday 17 August - London, Wembley Stadium - 90,000 capacity
Scarily, the BBC said that "In Australia, four million fans fought for 450,000 tickets. The mismatch between supply and demand is likely to be the same in the UK."
Oh shit.