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Listed buildings and structures are officially designated as being of special architectural, historical or cultural significance. There are over half a million listed structures in the United Kingdom, covered by around 375,000 listings.
Listed status is more commonly associated with buildings or groups of buildings, however it can cover many other structures, including bridges, headstones, steps, ponds, monuments, walls, phone boxes, wrecks, parks, and heritage sites, and in more recent times a road crossing (Abbey Road) and graffiti art (Banksy 'Spy-booth') have been included.

In England and Wales there are three main listing designations;
Grade I (2.5%) - exceptional interest, sometimes considered to be internationally important.
Grade II* (5.5%) - particularly important buildings of more than special interest.
Grade II (92%) - nationally important and of special interest.

There are also locally listed structures (at the discretion of local authorities) using A, B and C designations.

In Scotland three classifications are also used but the criteria are different. There are around 47,500 Listed buildings.
Category A (8%)- generally equivalent to Grade I and II* in England and Wales
Category B (51%)- this appears generally to cover the ground of Grade II, recognising national importance.
Category C (41%)- buildings of local importance, probably with some overlap with English Grade II.

In Northern Ireland the criteria are similar to Scotland, but the classifications are:
Grade A (2.3%)
Grade B+ (4.7%)
Grade B (93%)

Read more at Wikipedia Link

The equestrian sport of Eventing comprises three phases: dressage, showjumping and cross-country, which test horse and rider skills and abilities in different ways. (Both dressage and showjumping exist as competitive disciplines in their own right, but only eventing combines them and cross-country in a single competition). Competitions are called 'horse trials' and take place over one or more days, hence 'one-day event' (ODE), 'three-day event'.

There will usually be several classes at an event, each graded according to difficulty, complexity and/or duration, and run under either national rules (the UK governing body is British Eventing) or international rules (the FEI, or International Equestrian Federation). In the UK there are six levels of affiliated eventing to cater for all levels of horse and rider: BE80(T) (the 'T' stands for Training), BE90 (formerly 'Intro'), BE100 (formerly 'Pre-Novice'), Novice, Intermediate and Advanced. International classes are graded with a star system from * to *****. A five-star competition is the highest level of eventing. There are only seven such competitions in the world, two of which are held in the UK: Badminton in the spring and Burghley in the autumn.

Scoring is on a cumulative penalty basis. In dressage, each movement is scored out of ten, with the total being added up and converted to a penalty. In showjumping, penalties are awarded for fences knocked down and also for exceeding the time limit. In the cross-country phase, penalties are awarded for a variety of infractions such as refusals, falls, circling between lettered obstacles, and exceeding the optimum time. The competitor with the fewest penalties at the end is the winner of the section.

For more information see:
British Eventing website Link
Eventing entry in Wikipedia Link