Do tractors have to pass an MOT if they're to be used on the public highway?
Does this include emissions?
No, if a tractor stays within the CPH area or within 5 miles of the farm gate and is mainly used off-road it does not need a formal MOT.
However, is still needs to be road worthy and have insurance.
In 2005 the UK government thought about introducing an MOT for tractors but the plans were removed.
Poor tractor maintenance falls under the remit of the Health and Safety Executive
Tractors must comply with PUWER (Provision and Use of Work Equipment Regulations), in it its says "equipment must be maintained in an efficient state, in efficient working order and in good repair".
In theory there is a scheme of roadside checks by VOSA but i've never seen one.
You can get a free check from BAGMA ( the agri machine association ) but to be honest if you are in that group you are liekly to be a conscientious owner anyway.
The HSE recommend annual vehicle checks and records to be kept.