Video on How to waterproof a basement for habitable use should be carried out using a qualified structural waterproofing designer with both professional indemnity insurance and public liability who will design a waterproofing system in accordance with #BS8102 and building regulations.
The design would be adpted by building control and fully understood and implemented by a suitably experienced waterproofing systems installer who in turn, could arrange to have a 10 year insurance guarantee issued on the installation.
The following video explains the processes involved and the importance of doing things correctly to waterproof a basement in order that the finished article remains dry and free from damp for ever.
https://www.youtube.com/watch?v=lOCejK0Vn8Y