These guys have the specialist equipment to handle blocked loos beyond using a plunger. They had a vaccum to suck out all the waste from the WC, CCTV to view the blockage via the manhole cover. They used rodding to unplug the blockage, like you would with a bottle of wine.
Liam did a great job. Very pleased - calm, polite, and efficient. Their simple pricing structure is another big plus. At the end of the day I am relieved I got their help.