Is there any way, as MiL seems to not want to come to your house, that you could all go out for days as a family, MiL included?
I agree that as your parents, you will be closer to them and they are quite happy to pop in whenever, that is absolutely no problem! I guess that MiL is jealous of that, to some extent and as there seem to be some issues with her way of parenting as far as your DH is concerned, the way your family is with you and the way MiL will be bound to be different if not difficult and she may be trying to either over compensate or at the very least, make up for it.
Stick to your guns and only do what feels right for you and your DH. As your children get older, things may change and get better but only if your MiL's attitude changes as well !
4 Years On…..Health-wise, Has Anything Changed?
To think that London, or anywhere else for that matter, does not belong to any one demographic