I have found Skips in Newmarket. At the Cookie & Candy Outlet 16700 Bayview Ave before Mulock. They have a lot of products from the UK. It would be wise to call ahead to see if the owner has them in stock because its a pretty far drive (905) 830-0787
Skips are the best!
You can get Skips at The Chocolate Box and Mrs. Bridges' British Bakery. Bulk Mine near Yonge & Bloor and the Nutty Chocolatier (Beach location) sometimes have them. They are marginally cheaper at the Chocolate Box, which also stocks M&S soups, teas, biscuits and sweets (and Indian movies!). Not right downtown, but certainly closer than Newmarket.
413 Donlands Ave, Toronto, ON M4J, CA
Mrs Bridges' British Bakery
1 Eglinton Square Scarborough ON
2179 Queen St E, Toronto, ON M4E, CA
Mrs Bridges British Bakery Ltd
322 Eddystone Ave, Toronto, ON M3N, CA
655 Yonge St, Toronto, ON M4Y, CA
OH I feel you on missing these! If ever friends are across the pond in the UK I beg them to pick up "Skips" for me, as they are identical.
To tide myself over when the cravings set in, you can buy prawn cocktail flavoured crisps at some candy stores that import them - it's not the same texture but the flavour is similar. I've had luck finding these at the candy store just north of the Panasonic Theatre (Blue Man's home) on Yonge St.