There currently is one option to travel by night train from Inverness (United Kingdom) to London (United Kingdom), taking between approximately 11 and 12 hours: Namely the Highlander SB (I) operated by Caledonian Sleeper.
The Caledonian Sleeper connects London with various destinations in Scotland and offers a comfortable overnight travel option. The train provides comfortable sleeper cars, but also seats for budget-conscious travelers. There are basically two lines: the Lowlander and the Highlander. The Highlander travels further into northern Scotland while the Lowlander serves destinations including the Scottish metropolis of Glasgow.
The train offers three types of sleeper compartments: Classic Room (entry-level with bunk beds and washbasin), Club Room (like Classic, but with private toilet and shower) and Caledonian Double (luxury class with double bed and private bathroom). For those who want to travel at lower cost, seating cars are also available.
The train features a restaurant car called the Club Car, which is open in the evening and morning. The breakfast menu includes a traditional Scottish breakfast. Guests in Club Room and Caledonian Double have priority access and also receive breakfast included in their fare.
The Classic Rooms have connecting doors, allowing adjacent compartments to be connected for families or small groups. Also worth mentioning is the Family Ticket with discounted rates for two or three adjoining compartments. Accessible compartments are also available for passengers with reduced mobility.
For smaller budgets, the train also includes seating cars, which provide an economical alternative to the sleeper cars. Tickets are available from less than 100 euros. The seating cars also offer space for bicycles.
Regarding sanitary facilities, all sleeper compartments have at least a washbasin. Club Rooms and Caledonian Doubles go beyond this and feature a private bathroom with toilet and shower. Travelers in Classic Rooms use the shared toilets at the end of the car. The train also includes accessible compartments with adapted sanitary facilities.