Fuel leak from tank

Hi. First post here. Hoping someone can help

My car is a 1.2 HTP mk 2 2010 Fabia estate.

There is a leak from the fuel tank which happens when I am filling it. It only leaks when the tank is just about full. Petrol comes out under the car. Looks like it is emerging at the front of the tank. Looses a couple of litres then stops so the source must be quite high up. Some petrol pools in the well for the fuel pump but it’s definitely not leaking through the pump seal. That leaked petrol seems to get there through a small hole which is in the metal panel under the seat about 6 in back from the fuel pump.

Hopefully someone can suggest what the problem. And how easy/difficult a fix it could be. Dropping the tank looks like a right pain…..

Thanks!!