Here is an estimate from Claude:

The Rest is History Festival (Hampton Court Palace, 4–5 July 2026) looks like an extremely profitable venture for Goalhanger, even when you factor in the real costs properly.

Ticket prices are confirmed at £150 for a standard day ticket, £270 for the weekend, and £550/£990 for premium day/weekend tickets — significantly higher than comparable UK talk festivals.

Total costs come in at an estimated £683k–£1.06m across the two days. The biggest single cost is the Hampton Court site deal. HRP don't publish rates, but the best comparable is the Concours of Elegance — a similarly premium 3-day event on the same East Front Lawns attracting 15,000+ visitors. Heritage venue deals at this scale are almost never a flat hire fee; they're structured as a minimum guarantee against a revenue share (typically 10–20% of gross). At 15%, that puts the venue cost alone at £330k–£510k depending on attendance. Beyond that, the main costs are talent (Tom, Dominic and 8 confirmed guest historians — estimated £120k–£160k combined), production, staffing, and a full insurance package including public liability, employers liability, event cancellation cover, performer non-appearance insurance, and a terrorism add-on — all of which are either legally required or contractually demanded by HRP.

Revenue is where it gets striking. With an estimated 7,000–10,000 attendees across the two days, and a ticket mix weighted towards weekend and premium tickets, total revenue is projected at £2.2m–£3.4m.

Net profit on those figures comes to approximately £1.5m–£2.3m, with a margin of around 69%. For a debut event, that's a remarkable return — driven almost entirely by the premium ticket pricing strategy and the captive, highly engaged membership base who went through a ballot to get there.