For the WTD you need to record the hours in writing and give them to EACH employer.
For the EU driver’s hours, whenever you are driving, you need to make sure you are carrying 28 days of records. The records must show each minute of each days, there are not allowed to be any gaps. The way this is recorded depends on when you drive. Ideally all hours should be recorded via you tacho using manual entries. However, that would be difficult if you didn’t drive for several days. You may then be able to record the hours on the back of the tacho paper by the means of a manual trace. Lastly, if you are off for more than a week, you could possible use a letter or letters of attestation.
gov.uk/government/publicati … other-work
best to do some read or get yourself on a GOOD drivers hours and record Driver CPC course.