They both do just go to there webite and request a quote. I think it's for 8 or more people.
I love flying out of London and have gone to Florida through Toronto pro customs to US done there con transferring planes in toronto and have to go through security twice. Pro I found the price was only $50 more round trip then going direct out of toronto. So for me going from London made more sense I can get a ride or even park for the week way cheaper than in Toronto. Also found the amount of time needed was less actually than if I had to drive to toronto. Check in way easier in London.
Flown direct london to orlando pro easy small airport don't need to arrive hours before. Con customs in the US, and only flies direct once a week on Fridays and I think only December to April. Westjet connects to toronto ftom london now too but not sure of the timing.