Thanks for the replies, everyone!
I don't have the budget for 'high quality coins' unfortunately, so I'd probably be looking for cheaper/common coins. I'm the dreaded type of collector who can't restrict themselves to a certain country/ruler/denomination so I pretty much collect any circulation coins I like the look of. I do have a thing for larger silver coins, half crowns, crowns etc., so contrary to many people's advice I have to settle for lower grades than EF a lot of time, although I of course buy the best grades I feel I can afford.
With a 4 hour drive I probably wouldn't be able to be there before 11 and I could probably spend the whole day just looking at the coins (the local "fair" which is held once a year in collaboration with the local stamp collecting club only features around 5 tables of coins, although I did go to the Copenhagen Coin Fair last year with around 30-40 tables)!
I don't have a shopping list per se, I usually have a look around and see if there's anything I like, but I might be looking to get my hands on something early milled like a 1787 sixpence or shilling at an acceptable price/grade. Or whatever I find! 🙂