What price do you put on London 2040 Olympics and 2029 athletics meet?

Ed Warner writes on the 2040 London Olympics and 2029 World Athletics Championships ambitions and what price you can put on the impact such events have. For London 2012 and London 2017 read London 2040 and London 2029. Plans are afoot to persuade the IOC and World Athletics to return their flagship events to Britain’s [...]