Best time to get to a funeral procession viewing area tomorrow

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Hi - I am thinking of trying to view the funeral procession in London or Windsor tomorrow - but am wondering how many hours in advance of the procession time it would be good to get there?
Thanks

I reckon about now.

Tbh I'd say about now too.

On the news this morning there were people in the queue that were planning on finding a spot as soon as they had paid their respects. The interviewer seemed unsurprised.

For a lot of the best places you may need to go today or at least early hours tomorrow morning .

Yesterday

Thanks a lot.

I drove through Runnymede at 10am and not a single person was queueing.

I have a vague plan to skip central london and go to west london and watch by the road once the coffin has been transferred into the hearse. I can watch the funeral on tv at home first. I don't know if this is going to work. Maybe it will be too busy?