Originally Posted by ISTFlyer

Day 0 - 2 October
Day 1 - 3 October
Day 2 - 4 October
Day 3 - 5 October
Day 4 - 6 October
Day 5 - 7 October
Day 6 - 8 October
Day 7 - 9 October
Day 8 - 10 October
Day 9 - 11 October
Day 10 - 12 October

So, to be safe leave on 12 October and don't arrive at the UK earlier than 13 October.