Marriott rewards has historically converted spend for non US stays net of local taxes into US$ for base points at a fair exchange rate. This policy seems to be changing. My recent stay at the autograph threadneedles hotel in London had a net of local taxes total of GB£1227.75 which apparently is US$1686. An exchange rate of £1=$1.37. I've spoken to Marriott rerwards service centre who confirm that GB£1227.75 is the net folio amount posted and the exchange rate is automatically generated. This is a 20% rip-off. Is it just the threadneedles or has anyone else noticed if this new is a new approach? 6/7 years ago when I had a Hilton diamond membership I noticed a similar rip-off which is why I abandoned Hilton for Marriott!