Can You Identify This Egg?

[mikesnr1]

I'm not a twitcher, but hope someone knowledgeable can help me out!
On 18th October last I found a large creamy-white egg lying at the base of a rose bush, in my garden. It measures about 80mm x 60mm; looks much like a chicken's egg, but bigger; It is unbroken, without any cracks, has a hole at top end diameter 5-6mm, which looks just like the hole created by a hatchlings egg-tooth. It was cold, there was no life, but there is what appears to be "matter" inside the egg; I've stored the egg in a refrigerator. What is extraordinary is the way the egg lay on its side very close to the stem, under some thorny branches - how could it have got there?
I have photographs...

[Tuvok]

If you upload your photos to tinypic.com and then put the links in a reply to this thread somebody might know.

[Sam1960]

This chart any good ?
https://www.britishbirdlovers.co.uk/galleries/british-birds-eggs

[Chipchopper]

Just a guess, but I'm wondering that a fox may have had the egg stashed away somewhere or buried, decided to dig it up and got disturbed while moving it and just dropped it, maybe intending to go back for it at some stage.
Possibly a duck egg.

[melv16]

I'm thinking it's probably a goose egg, owing to its size.