Good Luck in your new venture diesel. Here's a link for the Alcohol Licensing which should cover all bases in that respect:
https://www.gov.uk/alcohol-licensing
You're chef's would need to hold an up-to date Food Hygiene Certificate, and it would be advisable that all your serving staff hold this too in case of an inspection:
http://www.food.gov.uk/business-industry/caterers/food-hygiene
You'd need to consider the premises that you are renting/ buy to use as it would need to be fitted out in accordance with the local councils building control guidelines and achieve a BC certificate of completion once shop-fitted (search your local council for the web-link) - costs approx £850+vat
And you would also need to apply for Advertising Consent for the fascia board/ swing sign and any Pavement 'A' Boards (again, search your local council - costs about £500 +vat
And you would definitely need to obtain 'Change of use' planning to A3 for a catering premises (if not already included in the lease from the previous tenant):
http://www.planningportal.gov.uk/permission/commonprojects/changeofuse/
(The above should be submitted by your solicitor if you can).
Then there are also business rates on the property to be aware of in addition to your rent/ asbestos considerations when doing the shopfit (get a survey done to cover your back and hand it to the shop-fitter so they don't disturb any asbestos during the works)(the Landlord may be able to provide an up to date one to save you some costs as part of the deal):
https://www.gov.uk/browse/business/premises-rates
If you want to play music or do any events, you would also need to apply for an entertainment licence (either full or temporary):
http://www.ppluk.com/I-Play-Music/Businesses/Why-do-I-need-a-licence/
These are just a few of the possible overheads you will need to consider on start-up. However, if you work hard and provide great food/ atmosphere at good prices, there is no reason why your business should not be a success.
I would however, seriously do some research on the location for your business and see what type of footfall you would expect to see first. What type of demographic are you looking to pull into your restaurant, would the location you've chosen be seen from the high-street? Could local radio help you out to advertise? Can your customers park nearby in a pay & display? (parking spaces attached to your restaurant will carry a parking levy).
Do you have some good suppliers for the produce locally and does it make financial sense on paper - i.e what would the costs be to bulk-buy, and what margin would you sell the food/ drink for.
Would you do a loyalty scheme for repeat business and how would you launch the business to best effect
Can you do a deal with a local printers to get cheap leaflets? Can you do the facsia and restaurant design in-house etc.
All of the above should be considered when making a business plan if you are applying for financial help to kick start the venture.
I hope this helps, even if only a little, and wish you all the very best with it! :-)