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@englishrosegardens wrote:

I'd say the PO is just telling you that because of the way you try and avoid paying the proper price for parcels.  People like you make it harder for the rest of us who do the right thing.

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I know this comment wasn't directed towards me, but what makes you say that ?  Just having a quick look it would appear to me a lot of the OP's items would definitely be classified as Large Letter -  as long as they are under 20mm, there shouldn't be a problem. 

Why wouldn't a key in a padded envelope be acceptable as a large letter  ?

Maybe I'm missing something here