In terms of flat cloud bases....Oleg has mentioned that many different cloud types are modelled and I'm sure that his knowledge of weather at least matches the attention to detail we see in the airframes.
I agree that this type of cloud formation is very common in Britain but the fact that we haven't seen it yet doesn't mean it ain't there. I think weather might be one of the items that is still being tweaked....it's pretty complex stuff if you think about it.
As Oddball would say...have a little faith baby...have a little faith.
