Your best bet is to contact Parasound direct and ask for a list of dealers in the UK who can do this for you.
Looking at the website,and the PDFs of the amp,it is very likely that it may run to new transformers for the amps,as was the case with Krell and many others,with different spec transformers being used in either side of the pond.
Also,you would need to consider the warranty issues,and using a 240-100V transformer is likely to be a non-starter given that you would need a transformer capable of at least 1300W at full power.
A possible although not cheap solution would be Ben Duncan's transformer based mains isolation,but for your proposed amps this would weigh in as both expensive and heavy.
This is available in 240-110V versions.