Glen any system having a new boiler fitted should be power flushed before fitting boiler using X400 as a cleanser and final fill of new installation with X100 or other manufactures products, if not they can void any guarantee. As for the 3 products listed at the end of your post I personally would not bother with.
Why is the engineer saying you need this done at this stage, are you having a problem? if so what.
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