I suggest using a spring form or loose bottomed cake tin. If not, line your tin with either a cling film or parchment paper so it will be easier to lift the whole pie out without breaking it.
I made this pie for friends and their children when they came over for dinner, and it went down really well. Take care with the condensed milk when boiling it, making sure the tins remain covered. I boiled for 2 hours and the resulting toffee was amazing! I don't like coffee much so I replaced the coffee layers with chocolate shavings, which tasted great. In terms of layers I used biscuit, toffee, banana, chocolate, cream, chocolate - lovely! The biscuit base needed a bit more butter and when I made it for a second time when visiting the mother-in-law for Sunday lunch it was much better thanks to a little more butter. She seemed impressed and all of the kids loved it! Great recipe which I will be repeating. - 18 Feb 2012
Made it healthier. Individual Banoffee Tarts. Use any digestive biscuit or shortbread and cut out the condensed milk. Use low fat toffee sauce mix poured over the base and then over the cut bananas. Can add coffee if liked. Finish with whipped Elmlea or Squirty Cream and crumble flake over top. Quicker and much less sickly/fattening. - 24 Jun 2009