Why multiple houses beats one hotel block
You get whole houses, not corridors of single rooms. People share by friend group / project team, not by what the hotel allocation desk decides. Kitchens for working breakfasts. Living rooms for evening debriefs.
Logistics
All properties typically within a 10-minute drive of each other. One main address shared with attendees, with sub-address sent individually. Single point of contact for any issues.
Cost comparison
A 4-day conference for 20 people at a city-centre hotel: £20,000-£32,000. Same group across 5 TNS partner houses: £10,000-£14,000. Plus everyone gets their own bedroom and bathroom and a proper kitchen for breakfasts. Better experience, half the cost.