mostly sell burgers
Not where I am (or anywhere else I've lived in the UK). In a decent pub (not a rough town-drinkers' one) you can usually get a decent pie, a roast, fish or scampi, maybe a mixed grill, plus regional dishes. There's also fish restaurants (especially in The North) and cafes can often surprise. My local one there (not at all posh or hipsterish) has two different pies plus a roast every day as well as the usual cafe stuff.
stargazy pie
A British food that no Briton has eaten. Apparently they like it in China where they think it's typical British cuisine.
Yorkshire pudding always goes down well in Poland, as does Lancashire hotpot (but be careful with lamb; sometimes Poles aren't keen on it for some reason). Gammon goes down surprisingly well; it fits Polish tastes nicely but isn't a thing there. Roast potatoes are well received too. Potted shrimps go down well, as does pease pudding, Glamorgan sausages (great for vegetarian guests) and almost any British dessert. I tend to do something simple like summer pudding, Eton mess, cranaghan or a crumble (apple is easier in PL; the apples are good there however Polish rhubard is desperately bad quality). Gooseberry fool also goes down well.
Also roast mixed veg. I've done that a few times recently for Poles and Ukrainians, and the lot has been gobbled up quickly. My standby dish if I've guests and can't think what to do is chicken and apple casserole. It's not a fine-dining thing so you can muck around with ingredients and/or make the day before.