The best trail tool to use depends so much on the site conditions; tools that work well in one area are useless somewhere else. I’m near Pittsburgh, Pennsylvania.
The best digging tool for us (by a long shot!) is a Rogue Hoe 55H http://www.prohoe.com/hickory_handles.html They’re made from recycled harrow disc steel, so they hold an edge better than anything else that I’ve tried. The hickory handles are very strong; I’ve never seen one loosen or break. And they have a dropdown box on the order form to select UK for shipping as well, though I didn’t see a cost.
I often take a Pulaski (which I keep very sharp) to use only to cut tree roots, but not for general digging.
I have a couple of Lamberton Trail Rakes as well. They are nice tools, but generally don’t work well for me as there are too many tree roots that they get snagged on. And shipping cost is very high (even inside the US) due to the long length.
If I’m on my own, I normally take the Rogue and a long handled, round point shovel. Rogue breaks up the dirt, shovel tosses it far away.