Let me play devil's advocate: You could make the case that there actually isn't. Of the most expensive English players - no. 1 is Maguire at an obscene £80m. The others are Sterling, Stones, Walker, Wan Bissaka and Chilwell - all between 45-55m. All but Sterling are defenders. After that I think it's Andy Carroll in the 35m category.
Both Maguire and Carroll (who was at the time of his transfer was no. 1) are desperate buys.
The defenders can be explained because they are defenders, and supposedly ball playing CB's and fullbacks are now the most important players around. Sterling is an outlier. Who's left? Oxlade Chamberlain, Drinkwater etc? But at £30m odd, isn't that the going rate for a player in the top 6 these days? This is a market where Dominic Solanke (an Altidoresque 4 goals in 63 games) is worth £19m.
The Grealish, Rice and Maddison figures are just speculation at this stage. I don't think anyone will quibble if Kane or Alexander-Arnold are sold for stupid money because...well, they are Kane and Alexander-Arnold.
If anything there may be a French tax: Lucas Hernandez, Pogba, Griezmann, Ndombele, Bakayoko, Lemar, Martial, Tolisso, Mbappe.
And now nearly every french player is touted as being over 40m.