I'm having the opposite problem to anyone else, having conflicts with PBP...
Mrs CET is (IMHO rightly) not happy with me disappearing off on long rides during the exam season (CET Junior 1 - A Levels, CET Junior 2 - GCSEs) but all the 600s have moved into the PBP qualifying window this year, which rather awkwardly overlaps with exam season. Fortunately the Border Raid is defiantly staying put in July which rescues me from the loneliness of a permanent 600 to complete my SR series.