Hi @anthonyashton,
Do you know what caused the electrics to trip?
Seems very coincidental that the electrics trip and then the hot water service for the shower no longer produces hot water.
A likely cause may be that the heater element in the shower hot water service may have failed (burnt out) and in the process tripped the breaker.
Does the power on/off switch for the hot water service have a light in it and does it still turn on, when the power is switched on?
Just going by the commissioning tests as shown on p.8 of the [https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwj-k8aEgbCEAxX9S2wGHfRVCJAQFnoECBAQAQ&url=https%3A%2F%2Fwww.mx-group.com%2Ffitting-instructions%2Fmx-inspiration-qi.pdf&usg=AOvVaw3aCS0TBbxHN5M5WMsyWehn&opi=89978449|installation instructions] to verify that power is reaching the hot water service.
I can't find any spare parts for the hot water service so you may have to contact the manufacturer's customer service section - see link above.
Also how old is the heater? Best that I can find out is that there's a 2 year warranty on it. If it is still within warranty, do not attempt to fix it yourself as this will void the warranty. Get it repaired by the manufacturer.