If it is a standard interceptor trap there isn't much to go wrong. On your link the first couple of images are not typical. It will normally be a chamber (manhole) with a channel at the bottom. In the downstram wall of the manhole there will be a trap with a rodding eye above. The rodding eye should have a plug in it. In most domestic properties the interceptor is the last chamber before the swage goes into the authority sewer.
The trap is the place where most blockages occur, or it might be in the length of drain running out to the sewer..
Where is the blockage? Have you got some decent rods? Do you know what you are doing? Rod the drain with some good rods with one of these www.wardsflex.co.uk/rubber-disc-for-plunger-100mm-4-pack-of-5/ FIRMLY fixed to the end.
Let us know how you get on.
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