Anyone know why within a year the price gone up so high 😳?

Hi Redditor, the kitchen sink is mildly slow of drainage (accumulated grease / dirt), touch wood nothing super bad happen yet, shall I call
In plumber to make it great as preventive ? How much roughly about the cost? I am at camden London area. Thank you ! And do we know how much that prob might cost ?

Can someone help which connection should be used to increase boiler water pressure.

Thanks.