Oh so many varieties, how hard it is to narrow it down. I've had to be tough with myself this year, so I'm only growing 12 varieties this time...
Earlies:
As well as growing in the ground I've grown earlies in pots, either in an unheated greehouse, or outside under fleece to protect from frost, to get the earliest spuds possible... My favs are:
1 Lady Christl for new potatoes. I found it early and healthy.
2 Red Duke of York. I found them more like a new potato if you dig em up early and better for roasting if you let them grow more.
2nd Earlies:
3 Anya for new potatoes
4 Kestrel as a general potato
5 Edzell Blue for mash (though better steamed than boiled, as it does fall to bits given half a chance).
Main crops:
6 Belle de Fontenay for new potatoes (I read they improve in flavour with storage, but they never seem to last long enough to find out)
7 Nicola (new potatoes / summer baker)
8 Rooster (well I've got chickens, so how could I resist this one
) Baker / fry / general purpose.
9 Sarpo Axona - very new variety, not tried it before, but marketed as combining very high disease resistence with excellent flavour for all round use.
10 Valor - high yielding, disease resistence all rounder.
11 Lady Balfour - boiling / general purpose, named after the Soil Association founder. High disease resistence and therefore good for organic growing (another I've not tried before but sounds great).
12 Pink Fir Apple - late cropping salad type knobbly finger potato. IMO worth the wait and the hassle of the knobbly bits. Good for storage - Anya is less knobbly, but I don't know if it would store as well? Now I just have to make sure I grow enough Pink Fir Apple so they last long enough to have some to store!!)
I have been to Potato day at the HDRA a few times. It was great, but it is so popular I found it gets really, really busy. On the plus side they have talks too. One year I went they were also selling a few of the more unusual varietes as eating potatoes, so you could try them at home before deciding if to grow them or not the following year. Another year they were selling some very unusual microplants. Don't know what else they'll have this year.
Many garden centres are now realising that the public want to buy potatoes in smaller quantities.
Buckingham Garden Centre had over 30 varieties last year (not been yet this year, but I assume they'll have them again). They sold them by weight.
But
Charlton Park Garden Centre, Wantage, Oxfordshire is my favourite. There is a potato event linked to them, the same weekend as the HDRA one, but it is in Whitchurch, Hampshire. Afterwards the seed potatoes are still available, by the tuber, in the garden centre and I've always managed to get what I want. No crowds and you can take your time choosing. Its potato heaven for me
Might just be worth asking around where you are. I have bought them for people before and posted on - but they are heavy and the postage ended up costing much more than the spuds (didn't help that they'd already sprouted and they had to be wrapped up very carefully to protect the sprouts
) This year my brother and FIL can buy their own