The hockey season is almost over! The finals have begun and there's only 2 teams left to decide the championship. Unfortuatly those teams are New Jersey and Colorado (in the USA). However in YYZ you can go downtown and visit the Hockey hall of fame and get a lesson on how the sport began and how it got to where it is today. It's worth it. Accomodations around the Airport are abondant. You will have about 10 different hotels to chose from. The Days Inn should be the cheapest of them. Expect to pay a minimum of 80$ canadian (£37). Most hotels have shuttles to/from the airport.
For the tickets, Try Air Transat, they fly to YYZ from MAN, LGW, STN, CWL, NCL and a few more. Canada 3000 also flys most of those destinations. As for the load factor I have no idea, but since the are charters they should be almost full. Air Canada could be an option from LHR or of course British Airways. For the second portion of your journey, Canada 3000 and Roots Air should be your cheapest bet.
Have fun........