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A late end to reionisation at redshift $z\simeq 5.3$ is consistent withobserved spatial variations in the Ly$\alpha$ forest transmission and thedeficit of Ly$\alpha$ emitting galaxies around extended Ly$\alpha$ absorptiontroughs at $z=5.5$. In this model, large islands of neutral hydrogen shouldpersist in the diffuse intergalactic medium (IGM) until $z\simeq 6$. We use anovel, hybrid approach that combines high resolution cosmologicalhydrodynamical simulations with radiative transfer to predict the incidence ofstrong 21 cm forest absorbers with optical depths $\tau_{21}>10^{-2}$ from thediffuse IGM in these late reionisation models. We include the effect ofredshift space distortions on the simulated 21 cm forest spectra, and treat thehighly uncertain heating of the pre-reionisation IGM by soft X-rays as a freeparameter. For a model with only modest IGM pre-heating, such that average gaskinetic temperatures in the diffuse IGM remain below $T_{\rm K}\simeq 10^{2}\rm\, K$, we find that strong 21 cm forest absorption lines should persistuntil $z=6$. For a sample of $\sim 10$ sufficiently radio loud backgroundsources, a null-detection of 21 cm forest absorbers at $z\simeq 6$ withSKA1-low or possibly LOFAR should provide an informative lower limit on thestill largely unconstrained soft X-ray background at high redshift and thetemperature of the pre-reionisation IGM.

The detectability of strong 21 centimetre forest absorbers from the diffuse intergalactic medium in late reionisation models