Very optimistic flight hours I'm afraid! The price difference between UK and USA widens with additional flight hours. Also, I can't see where you have allowed for UK landing fees. Unless you plan to do all of your UK training in the summer, you will find that you will need more hours in the UK than in the US purely to brush up your skills because of the longer time scale for training in the UK due to weather limitations. Also can't see where the costs of ground school and the exams are taken into account. Also can't see where you have allowed for the cost of UK ILS approach fees.
The main advantages of USA training is obviously the weather which in the USA allows for intensive training, the absence of landing and ILS approach fees. Another advantage is that you will be in an intensive flight training atmosphere where there are less distractions.
Now watch me get shot down in flames.
Edit: Sorry, on second reading I have to conclude that you haven't done your homework and your calculations are way way out. I see that you have allowed for food in the USA but not in the UK
I hope somebody who has done the training recently can give you a clear idea of costs. Essentially, whatever figure to reach, you will need to add 30% for contingencies. Also you don't say at what point you are at now.