have you tried city electrical factors? believe ive had some 2.5mm's off them before in 50 metre reels. although whether they do them might depend on the type of cable your after, if my memory serves me right ive had 7 stranded type cable (BS6491x i think) off them before in this but couldnt get the flexible stuff!
alternativly just by the 100 metres and put the spare 50 mtrs for sale on ebay!!!
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