Mac focused IT support company in the UK?

I’m currently helping a small organisation (12–30 people) move from an on-premises Mac mini server to the cloud. We primarily need device and account management and file serving, both of which have several options. However, the important thing is having a single sign on for each person (giving access to the Mac they’re at, their Google calendar, Office 365, etc), and one IT support company that manages the setup and is a point of contact if something’s not working. There are various local managed IT companies, but they tend to be Microsoft-focused. Can anyone recommend a company that uses Mac-based tools like Kanji or Jamf and will be more attuned to Mac-focused solutions? They need to be UK-based (or have a UK support team). I do have some leads to follow up, but recommendations from this community always carry a lot of weight with me!