Shipping Standard and Special


Can’t get my head around this one. I have setup a standard UK royal mail postage charge based on costs of order and this works fine, however what I want to add is the option for the customer to select next day special delivery at a standard cost of say £3.50 and for this to over ride the previous shipping costs.

I setup an additional destinations (one was uk wide and the other based on postcode) and added the additional shipping option. But it doesn’t appear in the drop down box on check out, just the first one shows.

Is there a way off doing this or is it something that is available only in the latest version of cscart (I have an older version 1.3.4- sp3 )

If so what would an upgrade cost to the latest version.