After microsuction
Microsuction does not introduce water into the ear canal. A current UCLH patient-information page advises patients not to put or push anything into the canal and says normal activities can resume after the procedure. That is UCLH guidance for its patients, not a substitute for the individual written advice you received here.
This page does not set a blanket Earwax Removal Devon rule for showering, swimming or a dry-ear period after microsuction. If your clinician gave you method- or finding-specific advice, follow that advice.
Read about microsuction