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Are you saying the 37A Ref method C is correct and and the other reference methods are incorrect? There is a glaring error (basically the 50% reduction in CCC) in the tables. I have never seen an erratum to correct the table. Of course the regs have never has a misprint before have they?

So which bit is incorrect?

Table 4D5 gives all reference method 103 CCCs as exactly half of the reference method C CCCs apart from 4mm T&E. Table 4A2 does not clear things up. So anyone any ideas why 4mm T&E has a greater than 50% reduction in it's CCC when installed in insulation?

Does this 0.725 rule apply if overload protection is not needed? It's 3 fixed loads that is complicated by a useless installation manual:-)

And that else is connected to this 3 block of strip connector? Your spotlight?

Well it's not one of mine. I know that as the spelling on the hand written label is correct

It might do if the landlord has fitted a VPhase.

I have a feeling that the OP is renting out a ****hole.

I fitted that - what's wrong with it?

I would not have any problems with running the UFH from the lighting circuit. The UFH will need RCD protection - either at the CU or via a RCD fused spur

Yes.

Was Bernard suggesting a 4mm spur from a ring final circuit?

http://www.esc.org.uk/fileadmin/user_upload/documents/industry/asbestors/asbestos.pdf for those that want more info.

I totally agree that there may be a reason for not exporting the earth. But putting two RCDs in series (with the suggestion that they are both 30mA ones) when the summerhouse is powered by SWA suggests a lack of thought has gone into the CU swap. Incorrectly labelling the MCBs says enough...

And would you consider that to be a badly designed installation?

I was thinking that there would now be two RCDs in series.

Adding the earth rod seems to be a pointless exercise!

The word "only" is not used in 433.1.5. It says that BS1363 MAY be supplied with or without unfused spurs and does not preclude the use of a 20A switch to supply an unfused spur.