All players - please note the following:-
You are ineligible to play in any league match until you have paid your Table Tennis England individual memberships. Please also ensure your contact details are up-to-date.
'Playing up' for another team is explicitly covered by Rule 7c. "Where more than one team exists in a club, no player may play in a team lower than that for which they are registered. In any season, a player may play up in a maximum of three matches regardless of the number of teams in the club. If this denies a player a regular game, application may be made to the committee for re-registration. However, if a player has been registered in a team lower than their personal standard or ranking would suggest is appropriate and by playing up in league matches would strengthen the other team, then playing up is not allowed." Note that there is no 'automatic re-registration' into a higher team.
Postponed league matches - this is covered by Rule 9. Any team is only allowed a maximum of two matches outstanding at any one time regardless of who requested the postponement. So if you have agreed that opponents can postpone two matches with you, and those matches are still outstanding, you have used up your 'allowance' and you will be the 'defaulting' team automatically docked 5 points for any further postponement. This 'two match' rule was introduced many years ago to keep league fixtures as up to date as possible.
Serving that does not comply with the laws of the game - every player should ensure they understand the current requirements of a good service and, crucially, make every effort to comply. Experienced players in particular should set a good example in this. There is ample relevant information available on this website and the Table Tennis England site and individual umpires should be confident to call when serves are very obviously faulty and gaining an unfair advantage.