The new MOT "piece of A4 paper" is not a document or certificate at all, it is a RECEIPT, to show that your car has passed the MOT test and been entered onto the VOSA computer.
As for ease or forgery, it does not matter, as anyone, such as the police, who needs to know if your car has a valid MOT will check with VOSA. To them the piece of paper is not proof of an MOT.
I guess a garage could give you a forged receipt and not actually test the car, but then you could sue them for fraud, and it is also easy to check on-line at
http://motinfo.direct...et-Status-Request.jsp
to see if the reciept is genuine.
VOSA =
http://www.dft.gov.uk/vosa/