Again, thank you for your opinions, much appreciated. From what you say the main issue seems to be childcare... That makes sense as with more childcare I'd have less child related taks, and at the same time I'd have more time for work (it is so hard concentrating when DC2 makes demands every five minutes)...
To answer some of the new questions...
DC1 (7) goes to school, so can take care of himself when home from school. He plays out a lot, or, when the weather is bad, just plays video games for an hour or two.
DC2 (3) goes to nursery for 4 sessions (half days). DC2 is very demanding, even though we do a good amount of "nice things" at the weekends, and genreally give the children a lot of attention (cuddles :-)) in the evening. DP is adamant he does not want to pay for any more childcare.
As to what I do to be able to work 40 hours whilst being at home, I have been awarded a (full time) research grant. I've been applying for jobs and grants, this happend to be more successful. DP wouldn't have an issue upping childcare if I had a job out of home, he just says it's not necessary as I work from home, it would be unnecessary expenditure (the nature of his jobs means he can be quite anal...).
DPs work is not that stressful, he's been really lucky considering his position.
He does commute, but he doesn't do any overtime.
As he managed to do (another) 3 degrees whilst working, I can't impress/argue that I did same amount of degrees whilst bringing up children.
As to 'let him to the tasks that I'm doing, he'll see what it's like' - he's been in the situation where he had to look after the kids for a few weeks, and, being the "superman" he is, managed without any problems. The kids listen to him more which makes it easier for him. Whereas when I, say, go shopping with them, they will both run off, the little one will have at least one major tantrum, when with DP they are angels...
DP often makes me feel inadequate because he can do anything, there don't seem to be any limits. But all my friends say I've done really well and, if anything, should be doing less...