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I'm afraid you are either confused or being deliberately obtuse and obdurate. I wonder which? :roll:

My reasoning is included in the bit you've quoted. I'm sorry if it confuses you.

Here's my two pennies worth...which might be controversial. It is the arrangement of circuits that complies or doesn't comply with the 17th. Dual RCD boards can facilitate this compliance, but it's true that there is no such thing as a 17th Edition CU (as has been mentioned). For a board...

Awww...bless...brings a tear to the eye.... :D

Thank you for telling me what you think I should have wriiten. It's so nice to know I have a Guardian Angel :) Now are you going to tell me that I shouldn't be thinking what I'm thinking? :lol:

Finally...

I suppose you think it's a nice straight line from rod to rod?

Instead of hiring the same old Robin, why not hire a few others and see what suits you best?

Aye, but what about the external parallel paths???

Yes but did you have very large lump of lead to take advantage of -albeit temporarily - plus a genuine earth rod. Parallel paths affect Zs on TT, TNS and TNCS. As I said before, there are some who reckon Zs should be measured with bonding disconnected - the IET is not one of them.

I think some of the latecomers should read the OP and carry on from there. Look at the before photos, read what action the OP took and what action will be taken in a few weeks. I predicted a reading of 0.1 to 0.3ohms for the lump of lead. Not a guess, I've seen it so so so many times before...

If you're going to use the parallel paths argument, please be so kind as to define ALL the paths and the contribution they make to the earth fault loop impedance. Then perhaps we can start eliminating them one at time to determine their exact influence. By your reckoning, TT should be banned...

The same can be said of doctors, lawyers, architects, accountants, librarians, politicians...the list could go on. I guess the difference is that the above wasters have post nominals after their names which justifies their ignorance. Their insistence on using them being directly proportional...

Not if it's one of the 3 in 100 that will fail. And with Zs readings of 0.3ohms...that's better than many TN-S installations. I assume you've assumed that the customer can swallow all the cost. Why should the customer pay for an electrician's whimsical appeasement of his conscience and...

And your RCD would make the whole installation 100% risk free?

Estimate: Replace metal BS3036 CU (TT) supply. Full PIR. Upgrade tails to 25mm. Install DP RCBOs x 10. Upgrade main earthing conductor. Install Main Prot. Bonding. Lift ustairs laminate flooring. Lift upstairs floorboards. Install FCU. Install fan. Connect wiring. Inspect & Test...

With the rapid turnover of housing stock over the last 15 years and the number of people (fancying themselves as developers and competent DIYers) leaving death traps and structural/other chaos hiden under the carpets and wallpaper, there is an argument that the Goverment has a duty of care to...

Glad to hear BC have done their bit. Few things are rocket science - even rocket science. Many domestic electrical jobs are not too hard - single phase. Add in 3-phase, workshops etc. and it ramps up. People defend themselves in court, diagnose their ailments, in fact do all sorts of...

If you can re-wire a living room in an hour, you can come and work for me anyday. It's up to you if you want to do it. If you want to put it on its own circuit, a 20A radial would more than suffice. And be quicker and save cable. All your AV equipment together doesn't draw very much - you...

But the OPs property is TT. This is how TT works. We have no idea what the exact mass of earth path is. Some of it maybe via next door's bonding. Some of it may be via a hundred or a thousand tiny parallel paths. But in any case, it's very unlikely that the major reason for a low impedance earth...