38. Maintel

Revenue: £103.9m (-2%)

Staff: 515

Maintel's first half of 2022 proved "hugely frustrating", CEO Ioan MacRae admitted in September as he blamed the hardware supply chain crisis for preventing the managed comms provider from delivering projects on time. Revenues consequently sank 13 per cent year on year to £46.7m in the six months to 30 June 2022. With Maintel's full-year 2022 results due out next month, we have had to drop back on the Avaya, Mitel, Extreme, Cisco and RingCentral partner's 2021 revenue tally in the headline of this profile.