The GOV.UK Prototype Kit provides a way to make interactive prototypes that look like pages on GOV.UK. These prototypes can be used to show ideas to people and to do user research. You can find an example (Home Worker Check-In Service) link and login details below that I built for my learning and to also get a good feel for the prototype kit and its components.
The GDS prototype kit would provide value with form validation and this would save having to do extra testing at the development stage. Users shouldn't be able to ignore fields on the prototype that they'd have to fill in on the live service. You can add styles to show how validation would look like.
Broadband speed is at the heart of Virgin Media products. I wanted to see if animation could improve the average broadband speed table on their website, so I created some animation prototypes to visualize this for further discussion with the team. The findings were positive as the animations helped draw users' attention significantly compared to the standard HTML table and helped increase user confidence. You can find the prototype link below.