Need advice on choosing the right folding bike I'm looking for a bike for about half an hour of use a day in town. Don't have room in my flat so it will be a folding bike, and it has to cost less than £200.

I consider buying this one

Is it a good choice, or are there better options in the same price range ?
There no bike on the market that is very good at folding and also very good at “biking”!  So you have to decide if you care most about the folding or how well it works as a bike.   For a bike to fold into a small space it must have small wheels.  Small wheels are never as good a ride as full sized wheels.

The Brompton is consider to be one of the best folders about if you care mostly about the “folding” side of the equation, however it costs a lot more than £200 unless you get a very good deal on a 2nd hand one.    

For £200 I think you will have to look on the 2nd hard market for anything good.
However even a “bike shape object” is better than walking or sitting in a road jam!  The bike you have linked to I would put in this category, check you are happy with its weight if you have stairs to need to take it up.    You will also not be able to take it on most public transport as it does not fold small enough.