This is going to be a month by month sowing thread. Please post what you are sowing each month, along with any good tips. (no discussions whether it is a good plan or not please ) Hopefully this will help new gardeners get to grips with succesional sowing too.
The thread will be cleared each month with the sowing tips posted in the Growing Techniques Forum.
One good resource is the RHS veg growing calender Veg calendar | Royal Horticultural Society.