Further, the swimming pool application is stated as being attached to the building, not a conversion of the building, so that implies that the Use Class of the building in question was not altered.
The issue is still the use [class] of the building, not any planning permission.
I'm waiting to receive the planning documents for the swimming pool. Although the pool building is attached to what was the shop, if there's any mention in the plans that the use of the building is to support the pool (changing rooms etc) then I'd consider that the class has been changed back to residential so therefore the previous class would be superseded by this.
The applicant wouldn't be able to change it back to a Class E shop without a change of use being granted, right?