beko dishwasher DWD4310s leaking sometimes during cycle ?

I'm just grappling with replacing my lower door seal. I'm not sure whether you have to take the door off which is complicated. I know I replaced a lower door seal on another Beko dishwasher I had a few years ago, The seal are cheap at around £6 each and in theory should just push in to the track where the old one comes out. I have managed to do that but it isn't secure. So I'm persevering! I'm sure it's possible.

Fiz
September 2014