Help me understand this power strip installation
Is it typical to find power strips of this kind directly wired into the mains?
Is a boiler and washing machine too heavy a load for the power strip?
Is there a better/safer way to wire this whole setup?



Somewhat unusual, but this has been done correctly, with a 13A fuse protecting the power strip and its cord, and the connections in/out of the fused connection unit (FCU) being glanded.
Not in terms of total load, but many power strips are of poor quality and shouldn't be used for high current appliances.
Yes, the FCU should be replaced with a switched FCU for the boiler and a good quality 13A socket for the washing machine.