Hello,

I would first of all asking if the bar has both tables (how many?) and counter service. I wouldn't worry too much about competition, since in the center of Lond it's fair to assume that you have enough demand. I would then proceed as following:

• Estimate the number of seats of the restaurant and the average time/customer
• Estimate how many customers per hour we can serve with the actual number of cash registers

You do this because the assumption is that the bottleneck of the process is the line that there will be to pay during the peak hours. You have to consider table service on top of that, since you bring the bill at the table.

Once that you have the capacity of the bar, you can divide the daily working day into time bands and make some assumptions on the "occupancy" of the bar in the different moments of the day. After this, you have just to multiply the number of bills by the average expenditure per client.

Please notice that:​

1. Even when your bar will be "full", you don't have to consider all the seats of the bar, because you can have for example 2 people sitting at a table for 4.
2. You could consider apart weekends and seasonality within a year. Don't forget to ask if you will be open 365 days/year.

Hope it helps,
Luca