The HOW mattered as much as the amount for me — they wanted the funds to have been settled in the account for a period, not just parked there the week before. A big last-minute deposit can actually raise questions. Season your funds well in advance.
The official guidance gives a figure but the forums are full of people saying the real expectation was higher, or that how you show it (savings vs income vs a sponsor) mattered as much as the amount. I don't want my application bounced over this. Without quoting numbers that'll be outdated tomorrow — how did you approach proving funds?