Who does them, and how much do they cost? I'd like another excuse for being crap at TTing, as well as being very slightly asthmatic with excessive foot supination and a strong right leg bias.
£100 from Anglia Ruskin University, for which I will get:
Body composition: height, mass, skinfolds, surface area, girths
Lung function
Bloods screening
Power test (6s maximal cycles)
Incremental ramp test for determination of lactate, heart rate and VO2 responses.
Full report highlighting all of the above plus:
VO2max
Lactate/HR/power-based training zones
Training advice
The previous test I did was at a gym, and was just a ramp test measuring heart rate and then producing a VO2max estimate based on that. I'm willing to believe they overestimated VO2max, the Anglia uni lot do testing for world class athletes so I expect the result to be representative.
There used to be a place at Addenbrooke's hospital but that's closed due to lack of funding. I bet it can be done in London, try googling for vo2max testing london. Top hit:
VO2 Max Test which is also £100, I dunno about swindon, you could try googling there.