All bathroom appliances connected to the pump???

[jim fennessey]

Dear lord he is cheap we charge £ 300 per day plus vat then parts

 

[Radioman]

You still need to make it clear to us what your role is in this repair/refit/refurbishment of this property. If you are the contractor responsible for subcontracting trades then it is your responsibility to ensure the tradesman is given exact instructions usually via a written contract or job specification. If not you leave yourself open to exactly this issue. Without written instruction you have no chance to claim "it was not done as instructed". For example if you just told the plumber to "fit a pump to boost the pressure to the bathroom" that's what he's done.
As an aside how qualified is the "plumber" you used?