I doubt very much if this is on a no win, no fee basis, given the money has to come out if a Chinese company that probably has very little cash. My understanding of WNW is that they laid off everyone but are not in either administration or bankruptcy. Some months ago they appeared to be trading- selling kits at an NZ airshow - and their website simply says they are “paused”.
I suspect WNW owners were somewhat taken by surprise that anybody was willing to step in and take on the Lancaster project given its size and cost. They may have believed they could safely ignore the mould maker as they had nobody to turn to.