Wow, that was quick! Sorry I was delayed, the dog took me out for a walk.
That's good news. I was looking at "3" but it's difficult to decipher as there are so many options. I'll look for the monthly contract.
Thanks for clarifying that. I have read that when "tethering" the sim conditions must allow it. However I did suspect that with this scenario the "sharing" is downstream from the "Mi-Fi". The degradation in speed when sharing shouldn't be a problem as my usage is infinitesimal compared to my other half.
I'll make sure it's a data sim.
I wondered why they throttled down the bandwidth after a certain time. I guessed it would be to do with demand but obviously it will be the kids!
I did look at the area we will be travellling through and not much 4G is there yet. However I was looking at this
http://www.amazon.co.uk/Unlocked-Huawei-E5776s-32-Mobile-Hotspot/dp/B00B5SZHFE/ref=sr_1_1?ie=UTF8&qid=1409472701&sr=8-1&keywords=huawei+e5776s-32#productDetails
At that price I thought I might as well.
Thanks to all for prompt replies.