Standing orders are simply an expression of the requirements of the Local Government Acts and other legislation, so, quote the 1972 Act, Schedule 12, Part 2, paragraph 10(2)(b):
"a summons to attend the meeting, specifying the business proposed to be transacted at the meeting and signed by the proper officer of the council, shall be left at or sent by post to the usual place of residence of every member of the council."
I suggest you consider adopting the latest model standing orders to ensure that you comply with the requirements. The model now differentiates between those elements that are required by law and those where the local council has some discretion, whereas previously, some councils altered or removed the stautory elements.