Potatoes and beetroot - confirmed sighting!!
Looks as if they are on the way. Not sure (as has been said) when you planted them but you can go earlier next year. I've not lifted any potatoes yet but they are probably ready - mine went in mid March I think.
Beetroot - some people are lifting theirs to eat - mine are getting there and I have another lot ready to transplant presently growing in plugs.
So... yours are looking fine - you will need to be patient..
Well done by the way. Great isn't it... keep going