A Polish quotation and a UK quotation cannot be compared just by converting the headline beam price. Earlier price ranges, exchange-rate assumptions and automatic UB-to-IPE equivalences have been removed because they were not supported by current supplier quotations.
Separate project country from supplier country
The cost tool treats UK as a project budget in GBP and Poland as a project budget in PLN. It does not model import transactions. Changing the country clears monetary inputs so that an old pound value is not silently re-labelled as zloty.
For a cross-border enquiry, ask who arranges carriage, unloading and customs formalities, and which charges the quote includes. Obtain transaction-specific tax advice rather than assuming that the calculator’s domestic VAT default covers an import.
Match the physical specification
Compare exact section, grade, cutting length, fabrication and coating. A UB and an IPE of roughly similar depth are different products; only the designer can approve a substitution. Keep the drawing revision with both enquiries.
Build a comparison record
For each dated quote record currency, net goods value, fabrication, transport, tax treatment, validity and promised delivery. If converting currency, record the rate, date and any payment fees separately. Compare the same delivered scope.
The official references are UK VAT rates and Polish VAT rules. They explain tax, not a market price for your beam.