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High-resolution UCLES/AAT spectra are presented for nine B-type supergiantsin the SMC, chosen on the basis that they may show varying amounts ofnuclear-synthetically processed material mixed to their surface. These spectrahave been analysed using a new grid of approximately 12 000 non-LTE lineblanketed {\sc tlusty} model atmospheres to estimate atmospheric parameters andchemical composition. The abundance estimates for O, Mg and Si are in excellentagreement with those deduced from other studies, whilst the low estimate for Cmay reflect the use of the \ion{C}{ii} doublet at 4267\AA. The N estimates areapproximately an order of magnitude greater than those found in unevolvedB-type stars or \ion{H}{ii} regions but are consistent with the other estimatesin AB-type supergiants. These results have been combined with results from aunified model atmosphere analysis of UVES/VLT spectra of B-type supergiants(Trundle et al. \cite{Tru04}) to discuss the evolutionary status of theseobjects. For two stars that are in common with those discussed by Trundle etal., we have undertaken a careful comparison in order to try to understand therelative importance of the different uncertainties present in such analyses,including observational errors and the use of static or unified models. We findthat even for these relatively luminous supergiants, {\sc tlusty} models yieldatmospheric parameters and chemical compositions similar to those deduced fromthe unified code {\sc fastwind}.Comment: Submitted to astronomy and astrophysic

B-type supergiants in the SMC: Chemical compositions and comparison of static and unified models