I am looking to finally start an online food ordering service and was wondering what the legalities of the setup were.
I would have an online ordering system for fast food shops. So customers can order from their restaurant online.
I would then sort out getting the order to the restaurant and delivery.
There is no cost for the restaurant and I may bring them more customers and provide free advertising. If they requested I would take the menu off the site.
Is this ok to do? I am in the UK if that matters.
I don't know about UK laws.
In many parts of the US, if you are going to be dealing with foods, you need a special license/certificate from the locality you're operating in.
Regarding just acting as a food shuttle service, there are no issues here with that sort of business. I would only caution you that over the years we have seen many many companies like that come and go. They seem to only be feasible in areas with very high population densities (like New York), and even then the margins are slim.
I have seen companies operate similar schemes in the past, although without insider knowledge, it would be difficult to know how much integration there was with the associated takeaways.
Some brief case studies:
Obviously you will want to keep your variant on the business model close to your chest, so that you can minimise competition. In either case, I would recommend talking to the takeaways in question as they may be open to profit sharing. It would also be advisable to speak with local interest websites (around my way, I'd say to look at http://www.ipswich.angle.uk.com/ as they already have an established reviews system of local takeaways - they seem to operate around most of the country as http://www.cambridge.angle.uk.com/ works - as does most town names I could think of) they may be able to introduce you to takeaways if they already have a relationship, or even offer to integrate with your proposed service when you're ready.
If you need to know about the law, you need to ask a lawyer. OTOH, you could just do it, and avoid annoying anyone, and so probably avoid getting in trouble.
If you want to do it, do it, but I should add (a) it's probably going to be almost impossible, because people are used to free delivery (b) a 24-hr grocery that delivers would also be nice to have in London.