Just dug this out of the Guidance:-

Live music, dancing and theatre
4.45 Statements of policy should also recognise that as part of implementing local authority cultural strategies, proper account should be taken of the need to encourage and promote live music, dancing and theatre for the wider cultural benefit of communities generally. The potential for limited disturbance in neighbourhoods should always be carefully balanced with these wider benefits, particularly for children. In determining what conditions should be attached to licences and certificates as a matter of necessity for the promotion of the licensing objectives, licensing authorities should be aware of the need to avoid measures which deter live music, dancing and theatre by imposing indirect costs of a substantial nature. Licensing authorities should be aware that the views of vocal minorities should not be allowed to predominate over the general interests of the community that the committee represents.

Pub games
6.9 Games commonly played in pubs and social and youth clubs like pool, darts, table tennis and billiards may fall within the definition of indoor sports in Schedule 1, but normally they would not be played for the entertainment of spectators but for the private enjoyment of the participants. As such they are not
regulated entertainment, and the facilities provided (even if a pub provides them with a view to profit) do not fall within the limited list of entertainment facilities in the Schedule. It is only when such games are staged for spectators, for example, a darts championship competition that the activity would become licensable.

So, if there's a dart match for a local league it does become licensable.