Songle Relay board safety concerns with 240V

Hi,

I was wanting to get some opinions on the safety of using these types of relay boards for UK 240VAC mains appliances.

Relay boards

I have these installed as part of a DIY heating control system via an esp32. It works really well.

But despite the UL stamp, and the fact they claim to be rated to 10A at 240V, I have also read that the separation from the common contact to the coil is not adequate. So, a potential failure could cause Mains voltage bridging across to the SELV side (5v) resulting in catastrophic failure and a potential fire hazard.

As much as I have enjoyed automating my house, it’s not worth burning my house down for.

Does anyone have any knowledge of these boards and whether they should be used for UK mains voltage.

Thanks in advance