Hey Simon I think you can enquire with any ID you like directly on their page. If you only select them specifically there is no reason for any other ID to contact you.
As I skimmed through the top rated firms, a few prominent IDs stood up as they often get praises from home owners. But when I enquire from these ID firms, I mostly got different IDs contacting me. My question, can I request for specific ID to serve me?
Thanks for any answers,
Simon