Setting a clear budget is crucial. For a small private dining event of around 10-20 people in London, expect costs to range from £1,000 to £3,000. This includes venue rental, food, and basic amenities. If you're opting for a mid-range option with more amenities and a slightly larger guest list, budget around £3,000 to £6,000. For a high-end event with premium services, including customised menus and entertainment, budget around £6,000 to £10,000 or more. Consider all expenses, from venue rental to catering. Look for venues that offer inclusive packages, like The Ritz or Claridge's, which combine private dining with luxury amenities for a fixed price. Negotiating with venues and booking during off-peak times can also help control costs.