These days, a Swiss Army Knife!
However, at the link below you can get very traditional English pocket knives from Trevor Ablett's small workshop in Sheffield, which is the city where most English blades have been made for at least the last few centuries. He's one of the only small makers still going - there are links to newspaper and TV features about him.
http://www.sheffield-cutlery.com/pocketknife.html
They're very much the style of every pocket knife I saw growing up that wasn't Swiss or a Chinese knock-off.
All his life my father has carried one just like the pruning blades that Ablett makes, but it's seen most use stripping cable.
If you're looking into buying something old, I'd have a hard time pointing you to anything except to say that it ought to have "Sheffield" etched or stamped on the blade, and probably be of sheepsfoot or pruner shape. The only spearpoints I've seen have been on very small knives with bone or mother of pearl scales that tend to look fancy but be rather delicate, with narrow, extremely thin blades and thin pivots. My father always viewed them as being for women, and I expect that was their target market.
Unlike the US, English industries tended not to be dominated by a handful of large companies. They did, however, tend to be dominated by particular locations. For ceramics - North Staffordshire. For beer - Burton-upon-Trent. For knives - Sheffield. I've seen a lot of English pocket knives that are ONLY marked with "Sheffield" - no maker's mark at all.
Good luck!