We have some english speaken people in our club at EBGB, don't know about UK ones, italians and germans they speak english to us.. (sort off)
The only problem with Grimbergen in my opinion is the rahter short runway 2000ft grass and when it has rained its all mud... but for the rest its all fun and hey, i live only 10minutes drive from the GA airport!!
I'm planning to go to EBAW for the IFR flights wich is 25mins drive, but depends were you live in brussels, i live in woluwe st.lambert wich is the correct direction to these 2 airports :-)
HAve fun and maybe we could enjoy some flights togheter!