Rule 13: Avoid Maidstone.
Rule 14: Don't answer the phone in a funny voice. The person calling is often considerably not who you were expecting.
Rule 15: Never try to impress your mother-in-law after your fifth Pimms.
Rule 16: You can't do handstands like you used to.
Rule 17: When visiting a hospital as an in-patient, remember to take pyjamas.