I'd happily take your money for an EICR. No way would I ever issue a MWC for someone else's work. Unless I was QS for a NICEIC company - then I'd probably do hundreds per week...
It all depends whether the wiring is enclosed in earthed metallic conduit, MICC, SWA or equivalent, or otherwise mechanically protected, and not supplying equipment or accessories in a room containing a bath or a shower. Only the designer (you?) can decide.
Page 17, Best Practice Guide No. 4 - "Does not give rise to danger or need improvement" = no code.
Best Practice Guides | Electrical Safety First
But that's just their opinion.
It wasn't my intention to imply the test is between the live conductors and the MET.
The test should be conducted "between live conductors and earth". Note that it does not say cpc) "Earth" has a very specific meaning in the regs. To perform the test properly, and to obtain a valid result...
Have a look at 612.3.1 The test should be conducted with the means of earthing connected, be it the supplier's earth, or a local electrode. Otherwise you could have a fault to true earth e.g. a bit of a steel framed building, and it wouldn't show up in the test.
Welchyboy1 is spot on - it's what the marketing people call "differentiating your product or service".
Don't forget that customers purchase electrical services (and virtually everything else) out of need. Not because of a low cost. What price would the OP's CU swap need to reduce to before a...
A bit of advice from cobwebinfo.com
"Unless you’re an exception, and have a significant cost advantage that is impossible for your rivals to match, never, ever try to compete solely on price."
Low prices lower the perceived quality. Customers who chose solely on price e.g. those who think...
You should disconnect the line from the MCB and/or link it to the earth bar - that's the way GN3 shows it, and it's much safer if for some reason you are unable to isolate the whole board.
EDIT: Although obviously that doesn't remove any parallel paths.
I check my clamp meter for accuracy by clamping one of my calibrated MFT leads. Run the ½xDelta n RCD test (as it should last for 2 seconds) @ 10mA, 30mA (and 100mA if you're on a non-RCD circuit) and make sure you get the appropriate reading. If not, get your meter checked out...
Whatever name you are thinking of, google it, check the domain and facebook availability, and also check companies house for current (and dissolved) companies with the same name. And while your at it check ipo.gov.uk for registered trade marks - infringement may cost you dear.
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