Emergency lighting needs to be checked every month. Any repairs or remedial work must be carried out within a reasonable time and all changes must be recorded.
Anecdotal evidence suggests that a significant proportion of organisations do not regularly test and maintain their emergency lighting.
This is partly because standards have changed (BS 5266 was updated in 2016) and the relevant people may be behind the times. But it’s also because testing emergency lighting every month (and annually for a three hour test) is rather laborious and labour intensive, and therefore expensive.
The fines for non-compliance are even more expensive.