Should a landlord pay for a locksmith?

Hi, Our tenant has given us a notice. I advertised my property and arranged a viewing.

I asked permission of the tenant – Can I show the property as they were not available and were out during viewings. They happily agreed.

I showed the house and locked the house before leaving the property.

Later my tenant called me and asked why have I locked the house as they couldn’t enter the property as they hadn’t taken the key for bottom main lock.

Note – the main door has two locks – one Yale and the main lock.

I was a 4 hour drive away and asked them to call a locksmith.

Now the tenant has paid their rent but deducting locksmith charge of £250.

Should the landlord be bearing the charge because tenant didn’t lock the property in the first place?

And secondly they forgot to take the keys with them.

The tenant’s argument is why I locked the property when I was leaving.

Thanks,

Aastha