27. Maintel

The financial woes of Avaya left their mark on the last set of annual accounts of this London-listed comms specialist, with revenues for the year to 31 December 2017 falling short of expectations at £133.1m. This included a 12-month contribution from Azzurri and five months from Intrinsic, which it acquired in August 2017. But CEO Eddie Buxton said in September that Maintel's Avaya practice has enjoyed a "resurgence" as he unveiled its interim 2018 results.