[ambodach]

They are too big !!

Unfortunately I live alone now, and 40% of my main crop spuds are weighing in at greater than 200gm and are too big for a single person meal - one is tipping the scales at 750gm.  These are Desiree main crop spuds.

Would I be better in future to avoid main crop potatoes or is there a variety which is better at producing smaller spuds?
Rob

[sebsands]

King Edwards are usually consistently smaller.
You could sow later or cut the tops off earlier if you want Desiree to be smaller.

[ambodach]

Many thanks Sebsands - worth a try. 
Rob

[New shoot]

It is worth looking at Jazzy as well.  These are 2nd earlies but mature into a main if left growing, so are a  handy duel purpose crop.  They don't get too large though.

I think they are only available mail order, so if you want a potato that is easy to buy in garden centres, try Kestrel.  These are also 2nd earlies\early mains and get a little larger than Jazzy if left to mature, but not giant sized 

[Hampshire Hog]

Lateral thought why not make some mashed potato with your somewhat large spuds.     
Divide into portions and freeze then use just the amount you want for a meal or meals.
Cheers HH