Best for reader mail, corrections, and short questions. Please don't send a deck as the first message — a paragraph is much more likely to get a real reply.
Advisory
Early-stage companies only (typically pre-seed to Series B).
Email with one paragraph on what you're building, what's stuck, and the outcome you'd want from an engagement.
Speaking
UK and EU conferences, company off-sites and podcasts.
I do two or three paid engagements per quarter. I can usually be persuaded to come on a podcast for free if the questions are unusual.
Elsewhere on the web
A note on cold outreach
I'm a one-person operation. I read everything but I can't reply to every message. If I haven't responded within two weeks, it's almost certainly capacity, not disinterest — feel free to bump the thread once, politely, and I'll try again.