"So I'm think the time has come to specalise, and due to one of my other interests, I'm thinking that a collection of birds from various makers would be interesting, and not too big to fit in my small flat!"
Hah! Stevetheb, I have to tell you that 'birds' will swamp your home in no time at all. I thought the same as you, and decided on "just birds from now on"......so far, a collection of Scandinavian birds, a huge collection of Langham birds, with some duplicates because they are all individually unique, a beautiful collection of Murano glass aventurine, latticino, millefiori and bullicanti birds, Selkirk ducks, Isle of Wight azurene, Isle of Man azurene, Granna glass, Chris Dodds Tweedsmuir, Leerdam, etc, etc,............. need I go on......?
So take care....they take over the house! Might I suggest you pick just one or two manufacturers, and TRY to stick to those? They are addictive.....trust me!