I think it's worth a chat to an accountant - you should be very proud of yourselves to try and make extra money - running a business can be extremely rewarding. Make sure you do your sums!
Tony
We go to Wong Ting - no strictly a buffet but still 'all you can eat'... Very impressed with the food and service - very friendly place. I think it's more expensive than the usual buffets but at £14.95(?) It's good value.