Heat oven to 200C/180C fan/gas 6. Put chips on a baking tray, toss with oil and season. Cook for 20 mins on the top shelf.
Dip the fish strips in the egg and then the cornflakes. Lay on a rack over a baking tray. Transfer the chips to a lower shelf, then cook the fish above for 15 mins, turning half way, until crisp and golden.