Many thanks for all your questions. I've answered two batches of them now, with more answers being written every fortnight.
You can find the first batch of answers here:
http://www.gardenersworld.com/ask-adam-one/
You can find the second batch of answers here:
http://www.gardenersworld.com/ask-adam-two/
Looking forward to receiving more gardening questions from you all. Please include as much background detail to your question as possible, as this really helps me provide a more informed answer.