Recording hours when driving is not your main job

Hi,
I am a newly qualified C+E driver doing the odd days driving for an agency on the days off from my full time job.
Following my last day driving I entered start of rest period on the tacho. I then had four days off. I then did 21 consecutive 14 hour nightshifts ( allowed because I am in an excluded sector under the working time directive) I finish at 06:00 Wednesday morning, then start driving some time on the following Wednesday after 7 days rest. This should just keep me under the 90 hour 2 week limit.I only drive 2 days a week.
What I cant find out is how this other work should be recorded. I currently write it into my diary. I don’t really fancy manually entering nearly 5 weeks of data into the tachograph, and if I did it would show an hours violation which it isn’t. Is recording it in my diary sufficient?
Cheers

As long as its diarised it should be fine to ‘?’ the whole period [emoji106]

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Cheers