I respectfully draw to your attention the first line of the description
for that product on the manufacturer's web-site [1]:
"CyberPower BR1200ELCD-UK offers *home* and office users a reliable
battery backup..." (highlighting mine).
Similarly, if one navigates to their "Solutions" and then "Home Theatre"
[2] using the main navigation menus, and then clicks the UPS image
displayed, the BRICs LCD range of units is listed in the category of
"Home & Office UPS Systems".
The manufacturer clearly targets this unit at the home market so I would
respectfully point that out to the retailer.
Similarly, I concur with what Mark Goodge has said elsewhere in the
thread. If you are purchasing this as a consumer, this is a matter of
fact and your rights as a consumer are enshrined in law and cannot be
changed by contract, waiver or disclaimer.
If you cannot get any joy with the particular retailer, I recommend
speaking to the manufacturer directly. Their contact details are on
their web-site.
However, be aware that they may have different channels for consumer and
business purchases and therefore may have different pricing strategies
to reflect the increased risks represented by sales to consumers.
Your choice may boil down to: insisting you are a consumer, with the
additional rights that affords you and therefore paying more for the
product, or accepting this particular supplier's "commercial only"
restriction to achieve a lower purchase price. (If you're using it for
a "Home Office", for example, you may choose to present yourself as a
commercial purchaser to avail of the better pricing available.)
Regards
S.P.
[1]
https://www.cyberpower.com/uk/en/product/sku/br1200elcd-uk
[2]
https://www.cyberpower.com/uk/en/solution/home-theater