The best advice anyone can give you is regarding make sure you buy it and have it delivered. Pay for it over the phone to be fully covered by distant selling regulation.
Email the dealer queries regarding tyres, brakes, evidence of service history in advance, quality of paint in person vs pictures (Swirls etc). You then have all that as evidence.
Further to that 2015 Consumer rights act also put much better overall protection in place for people buying used cars as a whole. If it does become faulty within 30 days you can still request a full refund if the car becomes faulty.
Compared to 5 years ago there is so much protection for buying used cars forms dealers and its a lot more black and white.
Looking over the car in question, if I was to make a blind purchase based on what I can find about the dealer online, the photos and the car itself I wouldn't be overly nervous. The car looks in really good condition 81 photos which is really good. No yellow fade to the lights, my only gripe is the rear plate looks wonky and the front plate looks bent/curved.