If you can unlock your phone, I'd look into getting a pay as you go sim or a 1 month contract. It should cost about £20. I got a text from Three when I returned back from my last trip saying if I was with o2, I would have spent about £5000 on data alone.
I got lost going to Millenia as well it was my first trip driving and I wrote down directions except I looked at the map and took directions driving on the left hand side of the road. It caused a big argument because my wife was giving me wrong directions and I was sure they were right.