WestJet to Launch London Gatwick Service from May 2016 | Airline Route
There's the link to Westjet
Not sure if links are allowed if not sorry
Gatwick is 2x 767 and 1 737
Total of 4 new routes being served
According to this link Westjet plan to to operate 6 new routes to LGW.
YYT - Daily 737-700
YYZ - Daily 767
YVR - 6 x weekly 767
YYC - 5 x weekly 767
YEG - 2 x weekly 767
YWG - 1 x weekly (767)
That 3 x 767 daily and 1 x 737-700 daily