They share an address with an accountancy firm called the Cook Partnership. Not sure if that helps.
They are on Twitter:
@db_aviation
They have a website:
https://www.dbaviationltd.co.uk/
This belongs to them:
https://www.flightradar24.com/data/aircraft/cs-dog
Looks like they have the office in the UK and an AOC in Portugal (CS registration)