This will be an estimate based on the information provided and your actual level of borrowing could be more or less than this once a lender has fully assessed any formal application or agreement in principle.  However, it should provide you with a good guide as to your borrowing potential.
 

One other thing to possibly bear in mind is that if you work as a qualifying 'key worker' there is a possibility of securing a mortgage of up to 7x your income - please ask for more details on this and let’s see if it applies to you.