Holders of a full category B (car) driving licence may drive any of the vehicles listed below:

    a passenger carrying vehicle manufactured more than 30 years before the date when it is driven and not used for hire or reward
or for the carriage of more than 8 passengers
    a minibus with up to 16 passenger seats provided the following conditions are met:

i. the vehicle is used for social purposes by a non-commercial body but not for hire or reward
ii. the driver is aged 21
iii. the driver has held a car (category B) licence for at least 2 years
iv. the driver is providing the service on a voluntary basis
v. the minibus maximum weight is not more than 3.5 tonnes or 4.25 tonnes including any specialist equipment for the carriage of
disabled passengers
vi. if the driver is aged 70 or over, is able to meet the health standards for driving a D1 vehicle

So, how heavy is it?

Nigle