Not a discount card — a genuinely separate ticket product only available to visitors from outside the UK, bought before you travel, that replaces individual tickets entirely for the days it covers.
This is the detail that trips people up most: BritRail passes are sold only to non-UK residents, and only from outside the country. Anyone who has lived in the UK for the past six months isn't eligible, including British citizens who still live there — though British nationals who've lived abroad for six months or more, with proof, do qualify. Passes cannot be purchased once you're already in Britain, so this has to be arranged before you fly.
A Consecutive pass covers a fixed run of days in a row — a 4-day pass starting Monday runs out Thursday, whether you travelled on all four days or one. A Flexi pass instead gives you a set number of travel days to use within a one-month window, so a 4-day Flexi bought on the 23rd of a month leaves you three more days to use any time up to the 22nd of the next.
Flexi suits a trip built around a handful of specific long journeys with rest days in between; Consecutive suits genuinely moving somewhere new almost every day.
Starts at roughly £96 for a 2-day pass, rising to around £568 for a full month, standard class.
A 3-day Flexi typically runs £120–165; an 8-day Flexi around £200–270, standard class.
Both cover England, Scotland and Wales — more than 2,500 stations on National Rail, including every route on this site's Journey Times page except the Caledonian Sleeper's cabin supplement, which is booked and paid separately even with a pass.
The homepage's worked example puts a real number on this: for a five-stop trip touching London, York, Edinburgh, Manchester and Bath, five separate advance point-to-point fares ran to roughly £250 against a 4-day Flexi pass at £165–200. The pass wins when the itinerary has several long-distance legs booked close to departure, since walk-up and short-notice point-to-point fares are the most expensive way to buy UK rail tickets.
The pass loses its advantage on a slower trip with only two or three long legs, especially if those are booked weeks in advance — GWR and LNER's advance fares on routes like London–Bath or London–York can undercut the per-day cost of a pass by a wide margin when bought early enough.
Seat reservations on many long-distance services are free but not automatic — you still need to reserve one, and on popular routes like London–Edinburgh, an unreserved pass-holder can end up standing. The Caledonian Sleeper's berth is a paid supplement on top of the pass. London's Underground and most local city transit are separate systems, not included.