I tend to have between £30 and £50 in my purse most of the time. I usually pay by contactless or chip & pin, it's easier and safer.
However, I arranged with the bank to increase the limit I can take from the ATM daily. It used to be the standard £250 per day, but it's been increased to £1000 as we occasionally buy antiques (for our home, we're not traders) and find that having cash available almost always gets us a generous discount! DH can take £1000 on his card too (the arrangement is for a joint account) so we could draw £2000 if necessary. We've never taken that much, the most on any one day was £1150, but it's a useful facility to have. Of course, we have to remember to keep the balance fairly healthy, but as we bank on-line that's easy enough to keep an eye on!
I certainly wouldn't advertise the fact that I was carrying a lot of cash!