Susan is having an affair with her handy man, but she still sees Mike because he comes round to visit their son - MJ! So they don't call him Maynard in full anyway!
I know what you mean about having missed a big chunk, but apparently this week's episode explains how they all got there (you can watch in on E4 on Sunday at 10 instead of waiting til next Weds).
i hardly ever see it (but always wish i saw more of it when i do). do you think they will all wake up half way through this series and realise it was all a dream?