If you own a vehicle, it is your responsibility to ensure that it undergoes an MOT test. The Alfa Romeo MOT Northampton test offers motorists some form of protection by providing that their vehicles are roadworthy and safe for use on the streets. It also reassures them that they won't break any law if they use their cars on public roads.

• The main reason which suggests you need to do MOT within a certain period, like after every 12 months or 10 thousand miles (or less), is to avoid a hefty fine or penalty points (totalling 3) for non-MOT'd cars; subject to limited exceptions. If caught driving a non-MOT'd car, both the driver and vehicle owner will receive an on-the-spot fine. If a non-MOT'd car is clamped or impounded, the owner will be liable to pay any removal and storage charges involved.

MOT comes under the "Road Transport" category, whereas UK Driving License falls under the "Transport" category. For example, you cannot use your driving license in place of an MOT certificate but can use an MOT certificate to tow your vehicle at low speed (like moving it through a crane, etc.) for repairs etc.

The slogan says - Annual test for your vehicle - Really?      

• As per DVSA (Driver & Vehicle Standards Agency), it depends on the type of vehicles registered in a person's name, not a business entity. Because business entities will need to do MOT for each car they use, and a person can't do it as per law.
• Road Vehicle (Construction & Use) Regulations – 1989, rag 33 - For these Regulations, a trailer is a vehicle that has no engine and is designed or adapted for drawing by another car or its engine (or by some combination of the two).

So if you are using "Trailer" on the road with your car, it needs to be done with an MOT test at least once in the year; it doesn't matter how many miles you drive yearly, Without an MOT certificate and driving with non-MOT'd Trailer will make you fined by Law Enforcement Officer and bring points on your license. If you don't have enough points left to be on the safe side, you will lose your driving privilege.

The number of trailers you are using more chances of Mot Northampton test failure or penalty is there because these vehicles are not designed for use on public roads, and that's why they don't undergo MOT tests at all. Trailer you are using daily, road conditions vary day by day, especially in the UK where it rains almost every day during some part of the year or other. During the rainy season, the dust build-up is very common, while the winter season brings salt, affecting the trailer body if kept outside without cleaning them periodically.

It is always wise to get your vehicle(s) tested for safety before taking them onto public roads, just like wearing a seat. It saves lives, after all.

 If you are thinking of keeping your Trailer for off-road purposes only, you cannot do an MOT test for it. To be on the safe side, though, you should check the VIN of the trailer and check if they are mentioned in DVLA MV3 or MV13 documents which are mandatory documents to apply for a vehicle license. Without them, the vehicle cannot get registered into DVLA records.

Keeping your non-MOT'd Vehicle-like Trailer outside the home without any valid license makes it liable to be fined by law enforcement officers (traffic police) because it is illegal to use public roads, subject to limited exceptions, like moving it through a crane etc. You can face points related fines plus clamping or impounding the vehicle if you are caught driving a non-MOT'd car.

A vehicle that is used as a "Public Service Vehicle" need to be MOT tested yearly or after every 12 months but subject to limited exceptions, i.e. Ambulance, Fire engine etc., 

For example, driving a fire engine to your home for works like cooking, cleaning the home won't make it liable to be fined, but using it on the road will bring fine and penalty points (totalling 3) if not done with MOT; subject to limited exceptions - basically vehicles registered under "business name".