Nscale, a London-based AI cloud provider, is reported to be facing investor skepticism over the valuation it is seeking in its planned US IPO. Other coverage says it filed targeting a valuation of up to about $35 billion, and that its listing plans are described as 'looking shaky'. Some commentators see this as a sign that the neocloud IPO window may be narrowing. Nscale is a UK-based AI cloud company, so its IPO reception bears on the UK AI infrastructure market.