Currants - or in Georgia; they are just not available; but raisins in various shades are. Black raisins can be substituted.
Marmalade - actually, you can get it at Marks and Spencer's, even in different varieties, thin and coarse-cut, and from blood oranges. Somehow I like to make my own marmalade; recently someone brought me over a tin of Mamade, the pulp and peel of Seville oranges.....
Lard - you'd think you would be able to buy this in a country whose diet is,er, not that easy on fat. But in fact you have to make your own. How do you do that? You buy some pig skins (with the fat on), stick them in a low oven for a few hours and the fat melts. Learnt that a long time ago in Scotland.
Mixed peel - you can get it in Goodwill in Georgia, but when you go there, you end up buying all sorts of stuff you don't need.....Here's a recipe for it; American, and typical in its large quantities.... a 'gallon bag' would almost fill my freezer. I bought a bag of oranges, drank the juice of 8 of them, made the mixed peel and probably have enough for the next year.
Bramble jam - a friend complains about that; also you have to make your own, if you find the brambles.
Baking powder - people tell me. The problem is that it comes in sachets, called 'kvepimo miltelai'. With a German background I know those sachets, from the Dr Oetker company, well. But it seems Lithuanians and Poles bake for larger families; the sachets we get here are for 1kg of flour; in Germany they are for 500g. So careful if you use them for a German recipe calling for one sachet! 'Levure Boulangere', which I bought at IKI the other day, delighted to find sachets for 500g, in fact contains dried yeast, as I discovered to my horror.....
Then again, you can buy all sorts of other lovely stuff, like zillions of sorts of mushrooms.