Also go for Korean, always good. Plenty in the West End and if you're eating out twice a day for more than one day, just do a Five Guys and get the Malt shake.
My kids love Dishoom and one's a veggie, great food, decor, service, soft drinks. Or just go for a kebab - proper Turkish not that Sussex, please the drunken Englishman, pitta and cabbage crap. Or head to Soho for a Chinese - take your pick there's plenty to pick from.