Be interested to see how they run the 52 miler - if it's a mass start then it might be interesting because effectively it's a race - but if there's going to be hundreds doing it you'd want to start in the front 50 to avoid the inevitable carnage.
Doing a sportive in Lancs the day before but might be up for this too - but the website is a bit short on details. If it's a staggered start with small groups going off probably give it a miss.