Buzzards Nest.

I wonder if anyone knows the answer to this. ?

While out bird watching the other day.  My mission to see a pair of Greater spotted woodpeckers, which I had see a few weeks ago.  There was evidence of a great place for them to nest..   I was hoping to get some photographs of the birds. 

On my first visit to this location.  I also saw what I thought could be a possible nest site for a pair of Buzzards, both of which i had observed displaying close to the small woods nearby.   So on my return I thought I would check out the tree I had seen a few weeks earlier,which contained a stick built nest, the sticks where more heavier than those used by a Magpie or a Crow.  This is what led me to believe it was possibly a Buzzards nest.

On my return I saw what I thought was a tail sticking out of the side of the,it was broad and quite square in shape.  As it was quite high in the maybe 30/40ft high, it was difficult to tell.  I took a picture with my camera, and used the zoom playback to see if it was what I thought it was.    See the photo I took and you will see my dilema.

Then out of the blue the bird left the nest.  It was a Buzzard, She was big, very big as you can probably imagine.   It took my breath away, the sheer size of the bird and what I must admit the shock. 

I would like to return and take some photographs hopefully when the chicks have hatched, of the parents feeding them.   From the ground and at a safe distance.

My question is, is this illeagle, would I need a permit.   I will tell nobody where this location is, whatever the answer. 

You can understand my excitement as a keen amateur photographer.   

A little guidance on this dilema would be appreciated.   Thank you.