Just checked on my trade account and both those batteries are still available, but about £5 more a year down the line.
Andrew - when I changed mine I ended up taking the entire side trim out (which means removing the black trim around the slam panel too) as it's so much easier to get the battery into the space single handed that way. The far lead on the battery doesn't have much space to work with if you're trying to slot it through the hole!
Prob not worth the fuel to come down here for me to give you a hand, but the offer is there to grab one from Halfords and help fit it if it helps you out 
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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