You need to give us a little more info.
Using WiFi is very limiting while traveling on the road, especially when there are areas that are devoid of any WiFi signals/activity.
I live in an area where Wifi signals and activity are practically everywhere, so using a WiFi ONLY device is, for the most part, not really an issue.
So, trying to boost WiFi on your iPad will not help as you actually need a way to gain access to the Internet through a WifI signal.
This is not easily done while traveling as you can't connect to the Internet while moving.
You need to stop at locations that advertise public WiFi.
If WiFi signals and public WiFi are scarce in some areas of the U.K. and Europe, then relying on a WiFi ONLY device is not a good or sound idea.
That stated, either purchase a new iPad with cellular data and pay for a cellular data plan for that iPad OR if you own a smartphone/iPhone that is on a cellular plan, you can go to your cellular provider or purchase online a small portable WiFi/MiFi device that will link your WiFi only iPad to your smartphone/iPhone and its cellular signal and data so you can use that iPad over Wifi from your phone’s data plan for consistent connection to the Internet while traveling.
Best of Luck to You!