One very simple strategy for my Royal Ascot - will be backing all Hugh Taylor tips blind. He is quite frankly a brilliant tipster and the only one I am aware of who has all his tips online (for the last 9 years, scroll to bottom of page):
http://www.attheraces.com/tips/atr-tipsters/hugh-taylor As you can see his ROI has improved year on year.
For those that are aware of him yes the prices go across the board in around 10 seconds so difficult to get on every day but just about possible - not that I do. I did some analysis of his tips over a year ago and he was definitely more prolific on the All Westher (rarely tips on the jumps), and particularly his 2 pointers (never does more than 2 pointers these days). So I always back those.
From memory I believe his last 3 year's of Royal Ascot tips have yielded a decent profit - obviously no guarantee the same will happen this year of course. Great thing about Royal Ascot is that due to the liquidity in the market you have a decent chance at getting the prices either the night before when he posts them on the ATR website (after a 5 min head's up via his twitter account), or early the next morning when they can drift back out. He's already tipped a couple antipost.
I realise many of you astute punters would rather pick your own, but for anyone like me who doesn't know much about the flat it does keep things easy