Can you post a picture of the sections you're worried about? Ideally you would deflate the tire and gently push the sidewall nearby to open up the gap until you get to glue.
Since you're in London, I'm guessing you're only riding these indoors at really high pressure, which makes me think it's probably fine. High tire pressure makes it more difficult for a tubular to roll, the opposite reason is why Cyclocross has so many problems.