Noticed this deal on U-switch but it is provided through Mobiles.co.uk (I could not find it directly through them)
There are deals on the Z3 Compact for under £20p/m however they have very little data allowance.
This deal has Unlimited minutes & Texts and 5gb of data. The price is £33p/m before claiming £120 cash back making it £28.
I know claiming cash back isn't for everyone but I'm all ears if you can find a high data allowance for under £30 without claiming cb.
I wont bother listing the phones specs as there are plenty of reviews out there
Total cost £792