Hi, bit of a panic with a scratch. Anyone have glacier white (ls9r) touch up bottle to sell around London. Would like to collect asap.

Hello, 

If you search on EBay, then you should find quite a member of suppliers who will deliver touch up paint to your door. 
If you want it today then you will have to search for local automotive paint suppliers. Of course, Halfords may well have your particular colour in an off-the-shelf aerosol or simple touch up. 
Kind regards,

Gareth. 

https://www.ebay.co.uk/itm/Audi-Glacier-White-LS9R-Touch-Up-Paint-Brush-Quality-Scratch-Stone-Chip-Repair/203143604877?hash=item2f4c4d6a8d:g:1cIAAOSw~dxfizYS

Yea was ideally looking to get it done this weekend.

Halfords seem to have the spray can. Could I spray that on a board and use a brush to touchup? Or would the consistency colour change be wise of it being spray?

yes  get artist thin brush   and  build  it  up   leave  for wile polish the panel  when  dry  next  day i would do that   kev

No, don’t spray it on a board.
Do as Kev suggests, but spray some paint into the removed lid of the spray can, and use that paint to dip your brush in. 
Kind regards,

Gareth.