I can help!
I was on the Best of England Tour in August 2023. I had the same concern during planning stage, trying to figure out exactly how much time we would have to see and experience as much as we could. For that very reason I kept copious notes during our tour, recording all the major time duration events just in case I ever had the opportunity to share with others.
I’m sure each tours ends up a little bit different, but this was what we experienced:
Day 1
Tour starts 4pm at hotel
• orientation walk on way to dinner, 5:30-6:30
• 6:30pm welcome Roast dinner together - Salamander Pub
Day 2
Leave 8:45am
• Bath walking tour (Royal Victoria Park, Royal Crescent, the Circus, New Royale Theatre, Pulteney Bridge, Bath Abbey exterior)
• Roman Baths (on your own, audioguide) (10:45am- we stayed till 1:30pm)
Day 3
Leave 8:30am
Bus to Glastonbury and Wells
• Glastonbury Abbey & grounds (10am-12:30)
time to explore town and matket
• picnic lunch together incl Scrumpy tasting (12:30-1:30)
continue to
• Wells Cathedral & grounds (2pm-4:30)
time to explore Vicors close, Bishop palace, town
return to Bath ~5pm
• 6pm leave for dinner together - Victoria Pub & Kitchen
Day 4
Leave 8:30am
• (extra) Lacock (9:30-10:30am)
• Avebury stone circles (11:15-1:15), walk surrounds
free time to explore village (St James church) & lunch
continue to Blenheim ~1hr20min
• Blenheim Palace (audioguide) & grounds (2:45-5pm)
arrive Stow ~6pm
Day 5
Leave 8:45am
• Stanway House and grounds (9:30am-12pm)
• quick stop in Stanton to see church
back to Stow for free lunch ~1pm
• meet at 2:30pm for Group walk. Bus to upper slaughter then walk to lower slaughter (2.2 miles, ~1hr).
return to Stow ~4pm
• 6pm dinner together & Local folk music session (till 9pm) - Kings arm
Day 6
Leave 8:30am
• Stokesay Castle (audioguide) (10:40am-12:30pm)
• English cream tea together
stop in Llangollen for late lunch (2:15-3:15)
arrive in Conway ~4:45pm
group Mead toast at harbor 5:30pm
free time to explore before dinner
• 7pm dinner together - Coaching Inn (at hotel)
Day 7
Leave 8:30am
• Welsh sheep farm, guide Garreth (9am-11am)
• Caernarfon Castle, guide Sue (11:30am-1:30pm)
• (extra) Slate mine museum (2pm-3pm)
return to conway ~3:30pm
Day 8
Leave 9:15am
• Bodnant Garden (9:40am-11:30am)
lunch/break stop after 2hrs (45min)
continue to Lake district
arrive Keswick ~4:15pm
• orientation walk on way to dinner 5:45pm
• 6pm Dinner together - Old Keswickian fish & chips
Day 9
• 9:30am Lake District boat cruise (hop on/off, 1 hr)
(optional) get off at Hawes End and walk back to keswick (arrive back ~12pm)
afternoon free
• 4pm Optional Hike to Castlerigg Stone Circle (we got rained out)
Day 10
Leave 8:30am
• quick stop at section of Hadrians wall (it was raining for us)
• (extra) Roman Army museum (10:30-11:25)
• Vindolanda & museum (11:40-1:30)
free time for lunch
arrive York 4:45pm
• 5:15pm York walking tour, guide Alfie
• 6:30pm dinner together - Vicroy of India
Day 11
leave 9am
• York Minster, guide Chris (9:30-11am)
Rest of day free
Day 12
Leave 8:20am
put luggage in taxis, walk to train station (15min)
• train York to London Kings cross station (9:35-11:40)
bus ride to Westminster, Luggage stays on bus
lunch on own near Abbey, Wesley cafe (12:45-2pm)
• Westminster Abbey tour (2pm-3:30pm), guide jeanne
bus from Abbey to hotel for check-in together (~4pm)
• 5pm group Tube Gloucester to Leister square
Day 13
Leave 8:15am
• Tube Gloucester to Tower hill
• Tower of London, Crown Jewels, white Tower, walk walls (9am-11:30am)
• Thames River cruise from Tower to Westminster (11:55am-12:30pm)
Free afternoon
• 7pm Farewell dinner together -Scoff & Banter (at hotel)
Let me know if you have any specific tour questions or if you need ideas for free time.