We’ve had the same issue..!!!!
Firstly, ensure the circuit is RCD/O protected.
Secondly, we fitted a small ‘metal’ cage enclosure over the gubbins if the D/L showing between the loft steps.
Thirdly, we installed a double pole ‘Cabinet type Sw’ that isolated that individual DL when the Loft Lid was lowered.
(This was a FIXED loft access, not a floating loft lid).
The main issue however, WAS.!!! even though the power was ISO when the hatch was deployed and the cage was protecting the installation…. It proved a hazard when using the Loft Hatch Stairs…!!!!
We fed it with SY 1.5 3c…..
We returned 2 months later, to do more work, and on the request of the client, ended up fitting LED trip to ALL loft steps under edges , BUT EITHER side of the Hazard if the DL cage unit.
They’ve been happy and problem/ incident free,!!!!
ENSURE YOU MAKE A COMMENT on your Electrical Cert, regards possible Access, due to install, and additions to over come the issue.!