British Swimming Calendar of Masters events is here (click on events and competitions).
2019 Masters Swimming Competitions
Mar 23 - Billingham Masters
Apr 19-20 - Scottish Masters, Edinburgh
Jun 14-16 - British Masters (Long Course), Swansea
Sept 1 - Swim England Open Water Masters, Peterborough
Oct 25-27 - Swim England Masters, Sheffield
Contact Julian Plumley for more information.