A: Yes. A 'retiring' chairman must preside if present (even if they are no longer a councillor following an ordinary election), can nominate her/himself, vote for her/himself, and use her/his casting vote in their own favour.
A: A parish council may arrange to discharge any of its functions through a committee of the council (Local Government Act 1972, s.101), other than those of issuing a precept for a rate, borrowing money, and the approval of a lottery.
A: A local council can certainly pay the legitimate expenses of its officers. This right is expressly affirmed by the Local Government (Financial Provisions) Act 1963, s.5. A council may thus pay a contribution towards expenses incurred by the clerk because the person holds the post of clerk, including, for example, a contribution towards expenditure on a residence because it is used as the councils office.