What do you really want?
Do you want to have net access when you travel with Lappy?
It is very expensive business. If you do not have deep pocket, forget about it.
If you have not very deep pocket, but luck enough to travel in certain places. You can get a lappy with wireless capability and access net when you around a WIFI hotspot. It is not cheap. You can normally find them in airport, train station and also some Starbuck Coffee.
If you have deep pocket, you can get BB access through Mobile network, Vodaphone, Orage and other operaters offer this service. The charge is over £100 a month and you need to buy a speail adaptor which is about £100.