Postpone until Saturday then. Or make do with one day this week. IMHO there’s nothing ‘magic’* about 5:2 that say you MUST do two days a week otherwise it won’t work, it’s just another way of doing calorie restriction / eat less move more instead of restricting every day by a lesser amount.
Fill your boots with fry up and then have a lighter lunch / dinner so you don’t massively exceed your ‘normal’ 2400 cal allowance for a normal day.
* the ‘magic’ bits about cellular regeneration and all that stuff; hmm, skeptikaljon is skeptikal on that. If it comes as an ancillary benefit to the weight management side of things, great, if it turns out to be bunkum, fine as well.