Millsy if you are looking to hold for the long-term and have a fairly high risk tolerance you may wish to consider not limiting yourself solely to the big dollar-denominated names and mixing in some Chinese / Asian / Emerging / Smaller Cap action too.
Your pension will no doubt have a fair old chunk of US large cap exposure already so you’d just be doubling down on that with the pure S&P ETF imo. You can get trackers for the Global/ Asian markets too obviously - I agree you are probably wise to avoid active managers for your purposes but I wouldn’t be too quick to write them all off (!)
The golden rule here is that you can never have too much diversification. Have a tactical tilt towards whatever you like but, honestly, never underestimate the power of diversification to help deliver consistent long-term growth.
