I presume you are doing just UK work>>>>>>
If you are doing International work ignore the domestic rules and use EU Rules
If your company uses a vehicle to tow a trailer then you must keep a record of any company vehicle you drive for the next 7 days
Whilst towing you must use the tacho to record your hours
When you stop towing you must still record your hours, this can be acheived in several ways:
If you are driving the same vehicle without a trailer, use the tacho and select other work
If you are in a different vehicle mark the tacho on the back
You can also use a domestic log book on days you dont use the trailer, (but it is easier to use a tacho every day)
The basics in simple lads terms. Im from near Hull too
If you are towing a trailer you must record on tacho as work (driving)
If you are not driving with a trailer the tacho can be set to duty (other work)
These are the domestic driving limits?
Daily driving
A driver must not drive for more than 10 hours in a day.
The daily driving limit applies to time spent at the wheel, actually driving. Off-road driving for the purpose of agriculture, quarrying, forestry, building work or civil engineering counts as duty rather than driving time.
Daily duty limit
A driver must not be on duty for more than 11 hours on any working day. A driver is exempt from the daily duty limit on any working day when he does not drive.
A driver who does not drive for more than 4 hours on each day of the weeks is exempt from the daily duty limit.