Where does the rest of Saral get a company's name, number, VAT and UTR from?

From Company Structure, which owns each company's legal identity. When a LINKED company is saved, or a Companies House difference is accepted, its name, company number, VAT number, UTR and registered address are written through to the company row that BillScan, letters, HMRC tracking, contracts and the audit file read. Only filled-in values are mirrored, so a blank here never wipes a number the company row already carries, and nothing flows the other way. If a number looks blank elsewhere in Saral, fill it in here, once — and check the company is linked (Add company / the row's edit carries the link).