Hope and Greenwood’s are probably the best old fashioned sweet shops ever. You can still by things by imperial measure and get bags of sweets made up. I’ve been to their shop near Forest Hill many times on trips to the Horniman Museum (I’ve mentioned the place many times), but I’ve never been to their central London shop.
It isn’t much bigger, but it is just as wondrous. The staff are wonderful and the range of confectionery is superb.
If you ever get a chance to visit one of their shops then you must, absolutely you must.