We ship cakes & wines inside London and to the rest of the UK. We use a different carrier for London for better pricing and next-day delivery. But the London carrier doesn't integrate so we can't switch to Carrier Service API. Any all-in-one shipping/delivery recommendations would be appreciated. I want to be able to deliver to all UK and inside London through one carrier that integrates well with Shopify or find a UK app that works with multiple carriers.
You can check out our Multi Carrier Shipping Label app that helps you integrate multiple carriers like Parcelforce, DHL, FedEx, UPS, etc and handle the complete shipping and tracking process. You can try the app with a 14-day free trial and contact us if you have any queries regarding your requirements.