You can use Traveline to plan your journey. This is a partnership of transport operators and local authorities, which was formed to provide impartial and comprehensive information about public transport. It covers England, Scotland and Wales.
Bracknell Forest Travelshare is a free to use journey share database. It allows people to search for others making similar journeys by car, cycle or on foot, and indirectly contact them to ask if they are willing to share their journey.