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Ah the old second cheapest option, like wine lists :)
You can bi-wire as @fizzy.bleach says but I've just got the two marked left and the two marked right twisted together at the ends.
Do Richer Sounds let you listen to different cables to compare? You only need better cables if they sound better/you can tell any difference. I went for those because What Hi-Fi recommended things have always worked for me and by the time I got to hear them they would be buried inside ceilings, in walls and under a lot of plasterboard. So I didn't want to want to replace them with something better when I listened to them!
There is nothing like listening to things. I was trying to decide between the Marantz MCR610 (old model) and the MCR611 (new model) for our kitchen. New model was £100 more but had better inputs and a few extra features, but not really £100 worth. So went into City Richer Sounds for a demo at the weekend, thinking there'd hardly be any difference, if any...
The MCR610 sounded so much better, and the difference was pretty huge. Even my other half who has smaller ears than me was surprised.
The Maplin ones are rubbish for the money compared to the (identically priced) Cambridge Audio ones. The Maplin ones have too much plastic, as Chris says the CA ones are all metal and all gold-plated.
My approach with speaker wire is not to buy the cheapest but to buy the cheapest What Hi-Fi recommended, so for the kitchen hi-fi I've just put in that was Audioquest FLX-SLiP 14/4 at £5 a metre. I don't think there's much point spending more than that.