I have taken your advice and spoken to Adam at Motorhomewifi and have purchased the i Boost directional system.l
I too have the iboost and have found it to be very good. Also well worth considering having access to the FON system even if you are only touring in the UK. All you need is to purchase the router and plug into your home system. No further ongoing costs and it does not interfere with your home wifi nor does it matter who your Service Provider is.