If a player does not turn up at the agreed time, or is more than half an hour late, the other player can claim a walkover and receive 2 points or the match can be rescheduled.
If a match is To Be Completed and then a walkover is awarded, the 'winning' player receives 2 points for the win + 1 point for playing. The original score remains unchanged. If the person who caused the walkover had originally won a point for a set won, that also remains unchanged + they keep their 1 point for playing.
If you are cancelling a scheduled match, make sure you get an acknowledgement from your opponent. If the message does not get through, the match may be deemed a walkover.
If a player wants to reschedule a match they must give their opponent a minimum of 24 hours notice. If a court cost is incurred the player who postponed the match is solely responsible for the cost of the unused court.
If less than 24 hours notice is given, the match may be recorded as a walkover in favour of the opponent and points awarded, although it is still preferable to play the match if possible.
If one or other player simply decides they don't want to play a match they cannot offer a walkover to the other. That is, for points to be awarded a match has to be scheduled and played. Aside from retiring through injury, players may not concede a match either before, during or after a match.
If the agreed time simply runs out for a match, neither player should concede the match. If the match can't be played to a conclusion at a later date, points are simply awarded for the completed sets.
Matches should be played within the round dates; the cut off point for play (and for the result to count) has to be observed.