Birds' Eggs Identification Question

Nearly a month ago I was planting busy lizzies in pots in my front porch and as I reached up to take down a hanging wall pot that was just above my head height, I felt something like dead plants inside it. I assumed that I hadn't cleared it out properly last year but when I stood on tiptoe, I discovered it was actually a birds' nest - with eggs in it! I was amazed as it was so near the house and yet I hadn't seen any birds in the area.

So I waited to make sure that no birds would come back and then last week took a photo -

Understandably there doesn't seem to be any information on birds' eggs identification on the internet and even my very old bird books didn't have much about eggs. But I'm curious to know who has been living in my porch, right next to my front door! So if anyone can tell me what bird laid these eggs, please do send me a message!

They actually looked rather more glossy than the photo shows and they're really quite small, compared to the thrush's eggs that the rooks that live on my chimney stole - and smashed! - a couple of summers ago.