Bluetits and great tits certainly do love peanuts. I have two peanut feeders and several pairs of each come regularly, plus the occasional coal tit. You are doing well to have sparrows though as although they used to be so common they are getting scarcer. Take care to position your bird boxes properly, for tits this will be around 8-10 feet high, and facing away from the sun and the prevailing wind, which in many gardens means facing north west. Don’t have them too near the house though. The hedge is not a good place for a tit box, but its just what a robin would like – but robin boxes are different from tit boxes – they have an opening all the way across the front rather than just a little hole. Also different sizes of hole appeal to different sorts of birds. Take a look at the RSPB website, which has lots of information. It seems a shame that you are having so little success after so much effort.

One final thought – don’t be shy of using the proper name for the birds! The old name was titmouse, but that isn’t used any more.