Can I deduct my time as an expense if I perform emergency repairs?

My tenants arrived back from hols to find water pouring in through a leaking roof vent down via a 9inch pipe connected to an en suite extractor fan.

I couldn’t get a local trades person to attend despite spending a full morning of calling. My tenants have and continue to be brilliant, but despite their understanding I felt obliged to fix the problem, not wanting it to get worse for them and me.

I was able to fix the vent, refit and insulate the extractor vent. The materials cost was approx £65, which I’m confident is an acceptable and permissible expense.

But what about my time and labour? It was a 40 mile round trip to do the first inspection, then a morning spent buying materials, a second 40 mile trip then a couple of hours performing the repairs.

If possible what would be a reasonable cost? Base it on getting a quote from a trades person?

Any help and advice gratefully received.

Thanks

James