In the UK, the rules for bringing a guest to your hotel room depend on the hotel’s specific policy and the "occupancy" you paid for. Most major UK chains (like Premier Inn or Travelodge) have strict fire safety regulations that prohibit "unregistered" guests from staying overnight. If you booked a single room but bring a guest to sleep over, you are technically violating the fire code and the hotel's terms of service, which could result in an extra charge or being asked to leave. However, for daytime visitors, most UK hotels are quite relaxed; it is generally acceptable to have a friend come to your room for a coffee or to drop something off, provided they don't cause a disturbance. Some high-end London hotels may require guests to sign in at the front desk or leave an ID for security purposes, especially late at night. If you plan on having someone stay over, the most "honest" and safest route is to book the room for two people from the start; in the UK, "per room" pricing is common, so the cost is often the same whether one or two people are registered, as long as the maximum occupancy is not exceeded.