I don't think the politics of envy comes into this. The man, whatever his commitments, even after deductions is earning a substantial amount. In this time of austerity is it appropriate, particularly as he's an MP, for him to be complaining he can't make ends meet when his income is far in excess of that of most people?
Don't forget he also gets expenses:
Alongside his salary, he claimed expenses last year totalling £55,828.96, including £27,192 in rent which is believed to be for his London flat, £148.80 in taxis and £83.55 for coffees and teas
Why does he travel in taxis? Can't he get the bus or tube? £83.55 for coffees and teas? In all my jobs I've had to pay for my own coffee and tea so why are we paying for his?
He needs to spend time in the real world thenb will he still say he can't manage on £90K.