Updated to cope with a candidate year/month at the end of the period where there isn't a next_month to read in yet - runs anyway to produce a provisional month
Updated to cope with a candidate year/month at the end of the period where there isn't a next_month to read in yet - runs anyway to produce a provisional month

Kate-Willett/HadISDH_Marine_Build,Kate-Willett/HadISDH_Marine_Build