Cycle instructor insurance

Morning all,

Part of my business includes running bike maintenance classes. I've previously used Cycling UK's cycle activity provider insurance for this and other aspects of the business, but have since learned from the broker that the policy does not cover any form of maintenance training - a key part of the business and indeed the national standard for cycle training.

Does anyone have any suggestions of insurance providers that might be able to cover the gap or even as a replacement for Cycling UK's cover?

Thanks!