UK tram installs are much more expensive than on the continent

The above is a cheap to install track system used in Den Haag with trams running on concrete blocks on sand giving easy access to services.

See Also:

This is primarily because they are designed by heavy high speed rail engineers, with little knowledge of short stage urban passenger transport design or requirements, and have installed rail systems that could accommodate heavy freight trains, ignoring continental experience and  modern track systems that do not require service to be diverted.  See:

2nd attempt track cost article