From about 3.30 onwards, depending on the amount of
preliminary business, the House moves on to what is 
described on the Order Paper as 'Orders of the Day and 
Notices of Motion'. Two or three items are usually listed. 
These include the various stages of government Bills 
passing through the House, but time is also found for 
some government and opposition debates, and occasionally 
Emergency Debates, taking place the day after they were 
granted. The first item listed will usually be the principal debating 
subject for the day. 

Debating usually continues until 10 pm, but there are also a few days  when debates end at 7 pm, to allow additional time for 'opposed private business' - when private legislation can be debated.