Sorry, I couldn't find pricing data for that day. The closing price for Bitcoin (BTC) in terms of GBP on July 31, 2020 was 8,650.47. It was up 2% for the day.
DATE
OPEN
HIGH
LOW
CLOSE
July 31 2020
8,483.67
—
—
8,650.47
Daily pricing data for Bitcoin dates back to 7/17/2010, and may be incomplete.