Just found out I have more work than I can manage stacked up until mid 2018 - all for me and where I am a single point of failure. I have several manager fighting for me and some smaller pieces of work mixed in too.

Any advice on how to get a raise while my stock is high?

@g-m-f I have several "bosses". Ironically my line manager is the least involved in any of these projects and he has little investment in the outcome. It is a bit weird.

I have an end of probation review coming up so maybe that is the place to highlight it as something I'd like to discuss further at that. I've not really worked in the private sector and before developing I was not really in a position where my work was something I felt I deserved a raise for.

Hand in your notice. You will get offered money to stay.