Financial Year 2007/2008
Total
Leader of the Council: £2,189.3
Leader of the opposition: £1,924.95
LGA Conference
Leader of the Council: £204.44
Leader of the opposition: £204.44
Hotels
Leader of the Council: £323.40 (4 nights)
Leader of the opposition: £323.40 (4 nights)
Food
Leader of the Council: £236.95
Leader of the opposition: £0
Travel
Leader of the Council: £622.58
Leader of the opposition: £0
Mobile Phone Bills
Leader of the Council: £797.97
Leader of the opposition: £1,393.11

The major differences here are travel, food, and mobile phone bills. The council leader travels a lot, as he represents the borough externally, and people shouldn't expect him to pay out of his own pocket when representing the council, where as the leader of the opposition does not represent the council.
Quite why the leader of the opposition's mobile phone bills are going on for double that of the man running the show, I really don't know.
