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Interesting pdf regarding inaccessible junction boxes, thanks for linking to that. It does back up what I was saying about crimped/soldered inside a choc box being a possible option. It makes it clear that screwed connections should be avoided, which was the reason I chipped in to let the op know that screwed connections are not as reliable as most diy'ers think.
My reading of the current regs is that alteration of an existing circuit does not require certification. Of course if you were to create a problem that compromised the circuit, for example didn't connect the earths together properly, an electrician would pick up on that if he needed to work on that circuit in the future and it would cost money to fix.
I accept the continuous development of regulations are designed to protect the innocent householders from electrocution, but there are still plenty of small jobs which are allowable and in my opinion it's better to share information about risks and encourage people to research the work they are considering. Wiring a new build and failing to test it properly is not the same as blanking off a tv circuit. Of course the professional electrician is held to a much higher standard than homeowner.
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Airhead
BS7671 - Requirements for Electrical Installations - IET Wiring Regulations, the Code of Practice that underpins The Electricity at Work Regulation: 1989, and The Building Regulations Approved Document P:2013 - Electrical Safety - Dwellings. If there were an incident or accident and the elctrical installation was found to be the cause, and it was not installed and maintained to BS7671 CoP, then the dutyholder may be much more liable to prosecution than if the installation were installed and maintained to the CoP; tragic example > http://electrical.theiet.org/wiring-matters/43/unlawful-killing.cfm?type=pdf
As regards offering electrical solutions remotely via written suggestions, it's a potentially risky business that could leave the author liable as above in the event of an incident.
On technical point,> http://electrical.theiet.org/wiring-matters/42/junction-boxes.cfm?type=pdf offers approved guidance on materials for jointing cables that are not accessible.