I did a short tour recently that matched your description very closely (~80 miles/day; staying in B&Bs (all pre booked); buying food en route)
I took: Tools & spares; Wallet (cards & cash); Phone; Waterproof; Snacks just in case the hoped for Greggs didn't appear; off bike clothes (pr trousers, fleece jersey, underwear); spare on bike clothes; Medication (if you need); Basic first aid; Toiletries, inc sunblock; charge pack & cables in case phone/gps ran low (it never did); Mains USB charger; Lock (Abus Bordo - no high risk locking situations); Hi-5 tabs, as no access to squash etc for water (a bit of a luxury).
I think that's about it. Spares and tools in an under-seat pack. Most other stuff went into a 1980s era stuffsack that sat on top of my rack. Immediate-access stuff in a small handlebar bag. My bike is here:
https://www.cyclechat.net/threads/loaded-cycles.277253/page-3#post-6496053
Things I didn't take and wish I had: Earplugs (sharing hotel rooms with my snoring friend); Headphones.
Things I took but didn't really need: Lightweight packable towel. Towels were provided at the places we stayed. But I'd still take it anyway just in case. Billions of cereal bars. We were never in danger of starving to death.
My touring friend, who was doing twice the distance that I did (He did Lejog, I went half way) but who was carrying basically similar stuff to me, maybe a bit more, had one of those bikepacking style bags that goes up the seatpost. I asked him what he thought about it and he was very happy with it.
He used 3 bolt cleats so his shoes weren't much good for walking around in. So in addition he had a pair of crocs (cheap lookalikes actually) for the evenings. My 2 bolt shoes were fine for everything. Here's my friend's bike