I don't think it is available in the UK. If you can't wait until later in the year, All4Cycling has it on line and had a good indication of the sizing. They have a really good service and I would really recommend them. The Team Website also has the kit, along with some cool t-shirts and hoodies. Given the last few days, they might have a sale on in the next few days.
Of the bike shops in Milan, Bicicletteria 1, 2, 3 might be your best bet but I wouldn't put too much faith in them stocking it. I really think on-line is your better bet.