Looks like its attack the MK5 month, had a massive stone hit me on Saturday on my way to work. AutoGlass guy came over today to inject resin into it but you can still see the impact point of the stone so its going to need a new windscreen. Is there anything I need to say when I speak to them on the phone as far as auto wipers and rain sensors?

Yup. Do NOT let AutoGlass, or any of the windscreen companies fit any of their "own brand" windscreens. AutoGlass make theirs in South Africa, and they are no where near as good quality as OEM spec (poor optical clarity, poor tinting).
Furthermore, non OEM screens are well known for messing with the sensativity of the rain and light sensors. Just demand they fit a genuine VW OEM screen - your insurance company must comply (they are supposed to only fit genuine parts, but how the fcuk they all get away with cheap screens is beyond me).
I had to report Norwich Union to Trading Standards, citing "monopoly" conditions, when they insisted that I "will ONLY use NUs own windscreen fitters, and will not get a genuine screen" - a quick fone call soon had NU eating humble pie, and me with a genuine screen from an independent fitter!
