@dameo182 Quality of speaker wire does make a difference up to a certain point.
Really cheap stuff tends to be copper clad aluminium (CCA) this is an aluminium core with a layer of copper around the outside. Generally CCA should be avoided for audio use, whilst technically it ‘shouldnt’ affect the sound thats not always a garuntee and it can cause others issues like poor contact at terminations if the copper coating gets worn away and the aluminium exposed to the terminal
On the other end of the scale is audiophile quality cable, this should be ignored at all costs. these are exactly the same, from an electrical point of view as applied to use in loudspeaker systems, as regular oxygen free cable (explained next) but they are hugely marked up in price to an uninformed market that is the typical audiophile for no other reason than they can.
The type of speaker wire you want to be using is regular oxygen free of at least 1.5mm2 (16 AWG) per conductor. Subwoofers and higher wattage speakers are better with 2.5mm2 (14 AWG). When purchased from reputible manufacturers this should only cost around £1.50-£2.00 per meter for 1.5mm2 when bought as 30m reels.
Found this one on Amazon UK that look to be right (links being weird take out the space after uk/)
here are a couple of UK site options to consider too
monoprice 30m reel 14 awg
or for a higher quality but still relatively sensibly priced
van damme 2.5mm2 tour grade, available up to any length from 10m and up in 1m steps (this is what i use most commonly for pro audio work)