Dear Sachie.
Thank you for you interest in CS-Cart shopping cart software.
Default CS-Cart has integrated tool allowing import products from CSV files. Please note that not all information can be uploaded using it. There are some limitations like product taxes, product wholesale prices, produt options.
By default, CS-Cart supports FedEx, UPS and USPS realtime shipping calculation only. If you need some UK shipping service to be integrated into your CS-Cart store then it will require additional custom development. Our engineers can do it for you for additional fee.
Don’t hesitate to contact put here any other questions you have.