Do Labour MPs need reading lessons?

Are some of our poor hard working labour MPs in need of a lesson on how to read legislation?

The reason I ask is they seem to have failed to understand the text of the budget measures they voted for last year with the 10p tax band....

..or did they?

I can just imagine the discussions 12 months ago

MP1: "Gordon I dont like this cut is sounds so unfair on the poor?"
GB: "keep quiet I'll be PM in a couple of months we get another 5 years in September and everyone will have forgotten the change by then"
MP1 "OK but..."

Need we say more?