Those easy fill baskets are perfect for busy lizzies - but they're not available this year because of mildew problems, growers aren't producing them. That leaves bedding begonias, or the larger corm begonias, cascade pelargonium geraniums, lobelia, trailing fuchsias, Lobularia maritima (sweet alyssum), Million Bell petunias or dwarf/miniature petunias generally, or pansies, with upright plants in the top such as Pelargonium Geranium or upright bush fuchsia.
I can't answer your second question - if no one else does, post it separately.

I think the idea with planting in potato bags is, that each time the crown of the potato plant breaks through the surface of the compost, you top it up with a little more. This avoids all the bother of "earthing up" which you would have to do if they were planted in the ground. I posted a question recently asking if just planting the potatoes very deeply in the first place would have the same effect, and got the answer that someone had tried it and the yield wasn't so good. I'm not sure about the potatoes themselves actually rotting. I think, if I were you, I would take some of the soil out, and replace it little by little as they grow. I'm growing mine in compost rather than ordinary garden soil, by the way, as we have inherent "worms" in our soil, which means our harvest would be full of holes. I am also told that these "worms" come with the farmyard manure which has been worked into the soil for the past 30 years.

I have 12 of these easy fill baskets and they are so easy to use. The biggest advantage being that you can use more mature plants. Last year I used begonias, geraniums, trailing fuchsias, lobelia and ivy, same as Bamboo suggested. Over winter I have had pansies and violas in the baskets and they still look good now.

what is an easyfill basket, do you have a link that I could look at as I find it a real pain trying to get the holes into the liners and then when I push the plants through they usually snap.

These are easy fill baskets they are great used them last year for first time
http://www.ebay.co.uk/itm/2x-14-Plantopia-Easy-Fill-Hanging-Basket-Chain-/170815414723?pt=UK_Home_Garden_Garden_Plants_Pots_Window_Boxes_CV&hash=item27c56461c3

Just Google easyfill baskets, Marion...

I would definitely remove some of the soil from your potato bags and add as the green tips of the leaves appear until you have filled the bag. Remember they need to be in full sun and well watered.

I found the easy fill baskets and on closer inspection of the pictures they do look good can I ask though when you pull the little bits up with the grill on them and plant your plant you obviously put the grill back over and then put your soil on top, is that the right way and does the soil fall out of the grills when you water them or do you cover the grill with moss before soil. I know it sounds like a stupid question but I always have a problem with my baskets so these look ideal.

Pass, no idea Marion, never used 'em.

Hi Marion
Have a look at this video on you tube
http://www.youtube.com/watch?v=eUvcyKMhjPA

Steve

thanks everyone