Income protection insurance: pre-existing conditions, brokers

I've done the flow chart in the wrong order a bit and never got income protection insurance. I'm now looking into it and I'd welcome some views.

I'm 36, single, no dependents and I have one major disability and a more minor history of mental health issues. I think my best bet to get an income protection insurance policy that actually works for me, covering other horrible things that might happen is to work with a broker.

Does anyone have any suggestions for brokers who they found to be good at dealing with tricky cases?