Wiremock and Soap UI are tools that were evaluated for introducing mock environments to test Eurostar's services independently without relying on unstable third party services. Wiremock allows for full control over responses but has more complex programming and maintenance overhead. Soap UI is simpler to use but runs on servers. Apiary and Mockable.IO are online tools that are simple to use but have limitations like inability to manipulate responses. Introducing mock services would allow for independent frontend testing, rapid testing, faster feedback, testing of more combinations, isolated testing, simulation of error scenarios, and more controlled services to support test-driven development.