Manchester City and Aston Villa expect Jack Grealish to become British football's record signing this week, 90 minutes can confirm.Earlier this week, 90 minutes revealed that talks are progressing between the two clubs, and they have now agreed on terms for a deal worth 100 million pounds.The previous record goes back to 2016 when Manchester United paid £ 89 million to bring Paul Pogba back to Old Trafford from Juventus, but the deal for Grealish will see City beat that figure and break their own transfer record by over £ 30…