These could work for him, but they don't solve the actual power/load distribution concerns (depends on how the PSU is manufactured):
»www.amazon.com/StarTech-6in-Pin- ··· 02O21XHQ
»www.amazon.com/HDE-8-Pin-Power-4 ··· 02BFNZAO
»www.amazon.com/Male-Female-Power ··· 05L90Q0O
There is one type of cable/adapter that I strongly recommend you DO NOT USE
»www.amazon.com/Micro-SATA-Cables ··· f=sr_1_7
This is a very, very dangerous cable to use. Let me explain: more often than not, the 12V CPU "rails" (for lack of better term) tend to be much more strict/precise (better designed, circuitry-wise inside of the PSU) than the 12V used on standard 4-pin Molex. The "rails" used for the 12V Molex connectors tend to have massive amounts of variance -- I've seen from 11.8V all the way up to 12.3V. Proof (and this is on a server-class board):
The 12V coming in for a CPU tends to have much more stringent requirements. So please, do not use Molex-to-CPU-power-connector adapters!
Edit: someone may want to verify for me which 12V type the Molex connector use, either +12V or -12V (yes it matters). I can't remember.
Finally: the OP is also in the UK/GB so these exact products may or may not be available at UK Amazon.--
Making life hard for others since 1977.
I speak for myself and not my employer/affiliates of my employer.