Hi Daisy
I think this is what you are hoping to accomplish.
Under variations tab -
Regular, make stock level 1 and enter your selling price.
Modifiers tab +
Manage modifiers, create new, select from list, give the checklist a name ie "select colour' then enter the colour options below in the add choice box (one colour at a time clicking done after each colour) leave the additional cost £0. Click save
That should do it, on the front end your customer get a dropdiwn box of the colours to choose from and after purchase the stock level will be zero.
