Gawd, I know what you mean - I have leafletted every one of the 72 houses in our road several times and I can't believe the crap letter boxes people have. Either they are the old vertical sort with a knocker, which even covers the slot, which is too small for anything bigger than a postcard or they are the stupid modern ones with a flap then furry teeth inside, which prevent anything that's not rigid from going through. So you have to fold the leaflet over the tops of your fingers and push them in then try to withdraw them without losing the skin off your knuckles.
Muppets, all of 'em. How do they expect the postie to deliver A4 envelopes and the paper boy to deliver their Express? You'll be pleased to know that I have installed a massive stainless steel letter box in our door, which takes the Sunday Times folded in two easy bites.
As for the Sunday Times, it's just become an adult rag. There's a scantily clad bird in almost ever section, even the business news to illustrate some article about an underwear manufacturer or some other thinly-veiled excuse. Not that I'm complaining, mind, but it's no longer a serious paper requiring concentration and slippers & pipe to read.