Thornycroft's reputation for fast ships

Which British steam-era shipbuilder had a reputation for making its ships especially fast?

Thornycroft is identified, followed by a brief comment that it also worked with gas turbines.

Thornycroft is identified as the British builder associated with unusually fast ships in the steam era. A follow-up asks what would happen if that expertise were combined with gas turbines. Such work is credited to Thornycroft, although the brief exchange supplies no specific vessel or performance figure.