Around $40 million (american dollars), that’s what is said everywhere, although, it is estimated ‘for real’ in $30 million. (Dollar lost a little value to pound. For you to buy £1,00 with dollars, you need $1,3470).
https://www.thebalance.com/what-does-princess-diana-s-will-say-3505096
https://www.townandcountrymag.com/society/money-and-power/a20745405/prince-harry-net-worth/