Small cracks cost £160, while large leaks cost £500. Depending on size, soakaway drain installation might cost £550 to £850 in labour.
Cleaning and deodorising drains using baking soda is quite a standard domestic method. Throw half a cup of baking soda down the drain and two gallons of hot water to flush it out. Baking soda can be used to clean the drains of a sink, a tub, or a shower, and it also has the added benefit of absorbing any lingering odours that may have been left behind.
If you want a copy of the drainage plan for your area, contact the city council. You might also hire nearby drain specialists in UK and have them draw up a map of your drains for you. Easefix is your go-to drain company in UK.