I did go for this tile and after some faffing around (and some more mud, but less than yesterday) I ticked it off. Now finally gone over 1,000 for Max Cluster and completed the vertical for my next Square increase.
46 miler today which completed the top horizontal so now up to 29 x 29 Square.
HS2 tried to sabotage me, I was riding near the NEC/Airport and every road seemed to be shut by HS2. Finally managed to find my way out but had to ride on the main A45 and around the big motorway roundabouts.
On the plus side, the route took me into Sheldon Country Park which has an Airport Viewing area right by the runway.