Whilst lantern and longcase clocks always used weights for motive power, the use of springs presented the opportunity for the evolution of smaller, more portable, bracket/Table clocks.
These suddenly appeared in the mid 1600′s and rapidly became the vehicle for London clock makers to show off their ingenuity and skills for decoration, cutting edge design and complications of function.
Sumptuous and even extravagant case designs followed, especially for the burgeoning export trade to countries like the Ottoman Empire, China and Russia. Indeed their popularity in London seems to have led to the demise of the longcase clock there.
Broadly speaking, case woods and dial styles reflected the stylistic development seen in longcase clocks, whilst the beautiful engraved and other decoration seen on the earlier clocks gradually gave way to plain functionality.
The verge escapement of the early clocks was only replaced by the anchor much later than in the longcase clock, probably due to the verge being much more tolerant of the clock being moved and less affected by discrepancies in the level of surface than the anchor.
Virtually all British spring driven clocks (and watches) had the sophistication or a fusee in their drive train(s). The purpose of the fusee is to even out the variable power output of the spring over its duration, which would otherwise adversely effect timekeeping (or the rate of strike/chime/music play).