A friend of mine was caught about 4 year ago on similar charges he was stopped with 83g of quality weed and they searched his house and found 4 plants that were a good size.He was charged with production of canibus and intent to sell but he managed to get his solicitor to make a deal and said it was for his own consumption.He walked out of court with a £150 fine and had to sign a disclaimer to allow the law to keep his lighting etc.He had 1 400w hps which is not expensive and a load of tin foil on the walls so he got a good result i think you should speak to your solicitor about some kind of deal like my friend got.Whatever you do stick to the story it was for personal use only as they cannot punish you heavely on personal but can jail you for intent.Good luck and keep us posted on the outcome.