Many churches now put all their sermons online, as we do. Here are a few that might be worth checking out:
Avenue Community Church, Leicester
Jesmond Parish Church, Newcastle upon Tyne
Chessington Evangelical Church
The Co-Mission Initiative, London
The Proclamation Trust, London
St Helen’s Bishopsgate, London
All Soul’s Langham Place
Emmanuel Church, Wimbledon
St John’s Newland, Hull
St Andrew the Great, Cambridge
St Ebbe’s Church, Oxford
Trinity Church, Islington

Some US sites also offer videos of many of their sermons:
Desiring God
Mars Hill, Seattle