As CF succinctly argues in his book, there's no way that anyone can recreate the 1939 environment (roads, weather, etc) that Tommy set his record in, so why bother claim that it is unfair to challenge it in 2015 with 2015 technology? The same can be argued about Godwin's 1939 record as he (Godwin in 1939) had many benefits that weren't available to the previous holders of the record.