Boasted to a similar query some time ago that I scored the Indy on Sunday at first attempt (bit gobsmacked) and the Observer after a year's patient sending. Results: duplications of dictionaries already on the shelf, but name in paper for something other than murder nice to see. Keep plugging at Radio Times (not 'cos it's a fun crossword; it's not) as I'd quite like one of those clever recordery thingies. But if I ever win RT then I'll stop as I'll have done my three and I can save on stamps.
Have always wondered about timing of return, or accidental inclusion of a Lakeland voucher, or daubing the envelope with can't-miss graffiti, but being a bear of little brain I'll just keep plodding on and hoping for the best.
How about Premium Bonds? Bugger all for yonks.