Correct Manhole Base?

Nathan Wilde's Avatar (by Gravatar) by Nathan Wilde in  General Construction 

Hi all. I'm going to attempt to install a drainage run myself for the first time for a new extension/annex in the garden. I'm a little confused and wondering if I can get some advice. Why do some companies offer a choice of "budget" or premium? Is tghere anything I should be worried about as there is a big difference in cost? Here's the link to make it easier: help greatly appreciated!

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