ah I see, my mistake, I suspect the ticket pricing will be alot more F1 like, than what people remember for WEC races of old.
I had an early bird email offer from Silverstone when they announced the meeting last week - the full 3 day weekend ticket set me back £95, individual days were Friday £35, Saturday £50, Sunday £70. Expect something similar or a little bit higher when they go on general sale on Tuesday.
For comparison, the ELMS 4hr race (LMP2, LMP3 & GT3s) ticket for September was £35 for the weekend while the BTCC will set you back £60 for the weekend now.