Re: ANTMINER S7 is available at bitmaintech.com with 4.86TH/s, 0.25J/GH
Mining still dead in the UK at $0.23, and shipping to a host is probably going to be a year to breakeven when the inevitable diff rises happen so no new machines for me 
Who are you with, I'm on 8p/KWh (0.12$/KWh).I'm currently with Eon on a business tariff, I was spending around £1500-£2000 a month and shopped around for the best deal which at the time was
11.83p day rate
6.76p night rate.
Which is an average of 10.56p, then add on the standing charge, climate charge (which goes up quite high when you start spending the above amount) and VAT** and you are up to 15p = $0.23
Now granted electric rates might have come down since then, but I only have a Titan left here, everything else has been sold or shipped abroad.
** I know you will mention claiming the VAT back as we have had this conversation before, but according to my accountant and further consultation with HMRC, because the item that you are selling (BTC) does not atrract VAT, you cannot claim the VAT back for the process of making them. You can claim the VAT back on buying the machines as you charge it when you sell them.
Day-night rates never pay for mining, as a flat usage pattern will cost more on that sort of tariff. I don't have any sort of climate charge and standing fee is about £1 a day.