Gas leak ?

Hi all

I have had a gas check done on a property and it passed
A week or so later when nothing has been used at property either hob or boiler i noticed the gas dial had moved ever so slight.

I decided to investigate further

I completely turned boiler off snd isolated hob and left over night.

The next day thenumbers had moved from 05612 686 to 05612 701. This is very tiny increase but it passed a gas check. Is this acceptable ?