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Not replacing Chinooks no - here's a highly speculative article which doesn't help much:
http://www.eliteukforces.info/uk-military-news/05042016-osprey-special-forces.phpLots of people on Twitter saying they are SAS planes but this seems unlikely.
Might be on their way to Duxford airshow. The US has had two at Mildenhall since 2013, maybe they just came down to that London for the day for a show and an Angus Steak House?
http://www.bbc.co.uk/news/uk-england-suffolk-23469986
Fox-
I read they were parts in a new film. Kingsmen (?). Which seems more likely.
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Seems unlikely that they were SAS planes if they were doing laps of the Thames, I believe they did 3 passes in the end, but may have been more?
Again, if they were on their way to Duxford from Mildenhall, London is a pretty big diversion involving flying past Duxford to get to London.
stevep
NurseHolliday
Why are Ospreys flying along the river? Have they replaced Chinooks?