25 metres is huge, as has been suggested get a pro in.
Mixing that much self-leveller is a serious amount of people, 2 mixing, maybe just 1 ferrying but 2 in spikes, 1 spreading the other using the spiked roller. Needs to be done quick, or using slower setting and left for longer - not often practical.
Last time I had LVT done (13 years ago) the fancy patterns (herring/parque) cost double that of a simple straight/angled design. Fitting was like a carpet job so LVT supplied and fitter was labour only, so it was either £100 or £200, but that included plywood/self levelling/adhesive and laying diagaonal with inset edging with plain planks scribed to skirting on 10m2 and 3 door in the hallway.
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