Well I took the plunge and got my wife a 12 month SIM for £17/month (unlimited data, 200mins and 4gb hotspot) - no mention of the 8gb hotspot, but don't use that much anyway).
She was paying £10/month on Tesco so thought she could benefit from the extra data (and better network) until April and also have the guarantee I'll have a SIM only deal for £17/month if they do decide to put up the prices by then.
They did offer that I could buy out of the contract and go on the SIM only deal, but they wanted £230 (might have done it if it was £130 as I'd be signing up with them for another year SIM only).
She is going to change her Tesco SIM to PAYG and then use the Three SIM as data only (she has a dual SIM phone).
I might have it back in April if the prices of SIM only go up or they cut back on unlimited data.
I'm guessing the SuperVoice (or whatever it was called) will not be launched on the Huawai Honor 4X (supports 800mhz 4G, but not sure about that)?