Thanks all for the informative and useful feedback. To answer some of the questions asked here:

 - These two pipes are the waste pipes from an en-suite bathroom above. The bathroom consists of a shower, toilet and sink.

 - The pipes were installed after the electrical work.

 - Unfortunately the bit of paper on top of the CU is just seem switch labelling stickers (I thought it might be a EIRC as well but was disappointed :-) )

For various reasons I need to get an EIRC done on my property. As was noted, the CU was installed in 2014 and I really don't anticipate any issues with the electrical services but I was worried that it could fail because of this issue. The electrician is coming tomorrow so I'll post back the outcome. Sounds like there would be no requirement to move the CU (although I think it would probably be better overall if it was repositioned).

As a side note, the previous owner of this property was a RICS certified surveyor and I'm pretty shocked that a supposedly qualified professional would install this. In addition, no mention of this appeared on my home buyer's report, despite the surveyor noting the position of the CU. Is this something that I should reasonably have expected would appear as a warning on my survey report?

Andrew Lees said:

As a side note, the previous owner of this property was a RICS certified surveyor and I'm pretty shocked that a supposedly qualified professional would install this. In addition, no mention of this appeared on my home buyer's report, despite the surveyor noting the position of the CU. Is this something that I should reasonably have expected would appear as a warning on my survey report?

Given that it appears to be safe, I don't really see why it should have been mentioned.

What goes into the report depends upon the small print.

When we sold my late mother's house, all sorts of reports were requested - when was the boiler installed, when was the shower installed, etc? I imagine that some surveyors are more thorough than others.

In any event, I don't think that you can complain. I assume that what we have seen in the photograph would have been readily seen by any prospective purchaser.

Andrew Lees said:

As a side note, the previous owner of this property was a RICS certified surveyor and I'm pretty shocked that a supposedly qualified professional would install this. In addition, no mention of this appeared on my home buyer's report, despite the surveyor noting the position of the CU. Is this something that I should reasonably have expected would appear as a warning on my survey report?

Given that it appears to be safe, I don't really see why it should have been mentioned.

What goes into the report depends upon the small print.

When we sold my late mother's house, all sorts of reports were requested - when was the boiler installed, when was the shower installed, etc? I imagine that some surveyors are more thorough than others.

In any event, I don't think that you can complain. I assume that what we have seen in the photograph would have been readily seen by any prospective purchaser.