If you are going to Windsor town/river then you are right beside the castle anyway and it's definitely worth a look. You get good views of the castle (incl tower) from the 'long walk' (Google Windsor Long Walk and you'll see photographs) which is open parkland. And it is only a few minutes walk from the river and right beside the town centre.

I don’t know but I doubt it

Yes, I saw people in wheelchairs when we were there

It’s between 10.30 and 11am

Not sure you can Winsor, I think it is outside the zone ,please check with London Transport, TFL

You can lock you’re bike at the Windsor And Eaton Central railway station just outside the castle walls. There are some bike stands under the archway from the station to Windsor High street and normally more are provided in a vast station sheltered concourse behind the Cinnamon cafe (best espresso in the town). Few more stands are down the hill past the arched Guildhall at the intersection with St Alban Street and Park Street bear the Soldier statue. You lock at your own risk but these are central areas and are normally pretty safe.

Own pace , we took 3 hours, lots to look at and read about but we did watch the changing of the guard as well.

Hello I didn’t see anyone having a picnic either during my visit.

Yes a new entrance for the disabled person, I have a gogo 2 buggy and it's very easy to get in and there is disabled lift to into the main castle and small lifts to get to different levels inside and I found the staff so helpful and always happy to make your visit special. Enjoy your visit!