There is a legal requirement for any vehicle aged three years or older to have a valid road test certificate (MOT).
The offence carries a fine of up to £1,000 but you cannot get points on your licence for this. However, your insurance may not be valid without an MOT so you may also be prosecuted for no insurance, which can carry up to six points, a fine of up to £5,000, possible disqualification and even community service or jail.