MK has been considered the Rolls-Royce of wiring accessories here for many years, and their junciton boxes are still certainly among the best, if somewhat expensive compared to other makes.

The "choc block pushed into the attic" method is all to common here as well, I'm afraid. The juncture between fixed cables and lighting fixtures is one area where many British homes seem to be severely lacking. People run regular T&E into high-temperature enclosures, or they take of a loop-in ceiling rose with three cables running into it and just choc-block the loop thru portion and shove it into the attic, etc.

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( looks a bit Screwfix-like that one though...! ) provided it's a good quality one that doesn't splinter the plastic as soon as you torque up more than a finger-tip's worth.
Darn, don't you just hate when that happens? Some of the cheap no-brand types are getting really bad in that respect.

By the way, for non-Brits, Screwfix is a big mail-order DIY supplier over here: www.screwfix.com