Hi @mike.brearton and welcome, it’s a pleasure to have you here! 
Thanks for sharing this idea with the HubSpot Community!
A short, company-specific ticket number sounds like a valuable addition for team collaboration.
While HubSpot ticket IDs are unique system-wide, having a simplified sequence could make daily operations smoother.
I’ve noticed a similar idea already present in our Ideas Forum: Have a sequential deal number created each time a deal is created . To contribute, you can upvote the existing idea and share more details about your specific use case in the comments.
In the meantime, if you haven’t yet, I encourage you to check the workarounds that @karstenkoehler and @CophieSollins shared on this topic (thank you so much!). These options are either to use a custom coded workflow action or to use a third-party tool.
Please let us know if you have additional questions, we are here for you!
Have a lovely day!
Bérangère