Here in the Midlands lots of significant roundabouts have names. They are generally named "......... Island" and this is on signs and used in traffic reports on local and national radio. See for example "Pentagon Island", "Priory Island", "Nottingham Knight Island", "Spitfire Island", "Bardills Island" etc.
Roundabout is also used, but often for smaller less significant junctions, although it can be interchangeable.
Cob is the only correct word for a small bread product without "extras" though. Teacakes have dried fruit, buns are sweet or specifically for burgers, muffins are cakes. Roll is for posh southerners, bap is for northerners and jokes, breadcake is just stupid 😉.
Housecoats and dressing gowns are not the same. A dressing gown is a garment for when you get out of the bath or to wear over your nightwear. It is normally towelling or fleece but can be cotton, satin or silk in summer, it opens at the front, and is secured by a tie belt. A housecoat is not night/bedroom wear. It is for keeping your clothes clean while doing housework or adding a layer for warmth. It can be button up like a pretty lab coat, or wraparound, or go over the head like a tabbard. It is traditionally something that you would not answer the front door in or go out in (to do so would be common) but you might wear in the garden/yard or answer the backdoor in it. For example see Mrs Hall in All Creatures Great and Small, who has both a housecoat and a dressing gown.