Call the orange fleshed ones 'turnips' and the litlle white peppery ones 'new turnips' (just as in new potatoes) as only seem to get them at a certain time of the year.
My Scottish cousin says the follwing
Scots~Neap English~ Swede Orange round and large
She says that the small hard white round things that the English call Turnips they don't have or eat where she lives (Fife)