A long time ago someone at work set up a premium bond syndicate rather than with the more common football pools. The advantage(?) being that we would always have our stake money, accepting inflation would reduce its worth. Still an advantage over the lotteries.
When it was time to disband came we were pleasantly surprised with what we had accumulated. We won £25 now and again, hardly seemed worth it at the time.
On disbandment I kept my share as bonds and added to it regularly to the point where I had to start buying in my partners name. The frequency of wins was such that the return averaged out at ~8% over a 25 year period. The return reduced significantly during the last recession but has recovered somewhat, the last few years has seen an ~2.5% return. Not going to complain about that.
I suppose I really should have looked for better investments, not to sure of the risks.
John