Sounds about right, the London Living Wage (a suggested but not mandatory minimum wage for living in London) works out at just under £400 per week, so maybe £5k

Sounds about right, the London Living Wage (a suggested but not mandatory minimum wage for living in London) works out at just under £400 per week, so maybe £5k to live on, the remaining £5k for other expenses, etc. Bear in mind it's not £2.5k/month for living expenses: it's £2.5k per month for all expenses: including building the product, etc etc.