Plumber to replace Mainsboost MJ3 Charger

[SteveP205]

The MJ3 Charger on my Mainsboost system has stopped working and I have sourced a replacement, but need a plumber that understands these installations to come and replace that unit and ensure it's commissioned properly. Let me know if you've worked with this system before and can quote on replacing the charger. Ideally someone in the SW London area.