I have a lemon tree and I live in central London.. it doesn't fruit year but every 2 years (which is apparently norma).Its grown in a large pot and I feed it with whatever I have at the time and thats about it..This year I have had a huge amount of blossom so hopefully will get lots of lemons again..It may be that seeds take longer to establish, i bought mine as a plant... so stick with it..
thanks for that I left mine out last winter and it nearly killed them but now they have lots of leaves on them lets hope for a better summer next year can,t wait for g n t with my own lemon