How can I find out how many UK based software development companies have revenues of more than £10 million per year?

We're providing complex software (like big data analysis, identity and access management and entitlement services) to enterprises and the emerging IoT industry and we are now looking for enterprises that have revenues of over £10m a year to sell our software to.

I tried PrivCo and Duedil, these are simply too expensive for us to start buying a premium account and Companieshouse.gov.uk is not quite what I'm looking for (or maybe I don't know to use this resource properly).