Are you waiting 6 seconds after switching the ignition on before cranking? It could be the throttle body needs to do a self check after its lost power. You can force it with VCDS but it automatically does it if you do as above before starting.
Mine only just fired on the last occasion of using the old battery and I got ABS and TC warning lights on together as there wasn't sufficient power for the ABS controller to self check.
If you do need a new battery there was much discussion about options recently when I needed mine. Halfords for a Yuasa 5 yr warranty effort, with a trade card discount, is what I went for in the end.
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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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