I think there are quite some options to deal with british emplacements especially when u play okw. You can use the LeIG, which is very effective vs emplacements as well as trying to rush it when the opponent uses brace. I'd also suggest to consider building a Walking StuKa since it's not only useful to damage the emplacements but also hit the infantry especially when gathered up in front of the forward assembly, which ultimately could be right behind the emplacements. You could also try to use a tank which outranges the bofors. Just let it shoot at the spot where the bofors stands. For that u could use a Jagdpanzer IV for example. I don't need to mention the Sturmtiger XD. Furthermore any kind of fire is effective to fight british emplacements. Maybe the Firestorm Doctrine comes in handy for that (never tried that so far). I'm not quite sure but I think the okw Raketenwerfer can outrange a bofors as well. Last but not least there are also off-map artillery abilities as well as doctrinal howitzers and Antitank Emplacements which can be used to deal with the brits.
Hope this was helpful.