The 19-year-old spent time last month in the capital getting a further feel for the Olympic pool, following on from the British Gas Championships in March, as part of British Swimming's national squad camp.
Willmott was given the privilege after collecting silver in the 400m medley at the trials last month - a performance that saw her earn Olympic selection along with 37 others upon its conclusion.
However, while Willmott, who is set for her Olympic debut, benefitted from vital training in London, she also had a rather unfortunate mishap - fainting and falling over after a routine blood test.
All is well with Willmott though and she wants to prove that with every down there is an up by reaching the 400m medley final when she returns to the capital in less than four months time.
"Everyone was training really hard over the week but I had a bit of a disaster. After a blood test I fell and hit my face and it was a bit of mess," said Willmott.
"But everyone did really well and bonded as a team so now when we get to the Games we will know each other inside out and can be there for each other.
"I was really happy with my swim at the British Gas Championships, I achieved a personal best in the 400m individual medley and I managed to get the time I was aiming for.
"So I'm really happy with how it went and obviously very pleased to get my place on the Olympic team - to achieve both goals in March was fantastic.
"Training has been as intense as it was before the trials and I'm just looking at the things that perhaps went wrong at the trials and trying to put those right before the Olympics.
"Hopefully I can achieve a personal best in the heats and if I do then that will give me a great chance of progressing and getting as close to the final as possible."
Willmott spent time with Hannah Miley, the other qualified British swimmer in the 400m medley, and Roberto Pavoni, who will take to the pool in the men's race, in particular in London last month.
And, while Miley is expected to deliver a medal having collected silver at the World Championships last year, Willmott, who failed to book a trip to Shanghai, will have one eye on future Games.
"I'm really excited to compete at the Olympics. Some people never get the chance to compete at an Olympics at all so it will be very special but it isn't coming at the peak of my career," she added.
"So I'm just going to try and enjoy it as well as trying to do my best and getting as far as I can - when you're there it's anyone's game and it's getting exciting now that we are almost there."