NorthWest Biotherapeutics Inc (NWBO)

[skitahoe]

I don't know that you're correct about an RFI being a material event.   I don't believe the company ever announced having even one.  I also believe that while 60 days is allowed to answer an RFI, it can be a very minor event answered in a day or two.
I believe that they have had numerous such discussions that could be formally be called RFI and they often are resolved very quickly. 

We'll really never know what has been discussed, but hopefully what they learn in working with the UK results in making the submissions to other regulators much improved. 
Over the years I have learned that many things thought to be material events by investors aren't by the company.   In many cases, even monetary payments are ignored if below levels the company decided is routine, of course they show them in the financial reports.
Gary