  Previous studies have demonstrated that continental carbon-silicate
weathering is important to the continued habitability of a terrestrial planet.
Despite this, few studies have considered the influence of land on the climate
of a tidally-locked planet. In this work we use the Met Office Unified Model,
coupled to a land surface model, to investigate the climate effects of a
continent located at the sub-stellar point. We choose to use the orbital and
planetary parameters of Proxima Centauri B as a template, to allow comparison
with the work of others. A region of the surface where $T_{\text{s}} >
273.15\,\text{K}$ is always retained, and previous conclusions on the
habitability of Proxima Centauri B remain intact. We find that sub-stellar land
causes global cooling, and increases day-night temperature contrasts by
limiting heat redistribution. Furthermore, we find that sub-stellar land is
able to introduce a regime change in the atmospheric circulation. Specifically,
when a continent offset to the east of the sub-stellar point is introduced, we
observe the formation of two mid-latitude counterrotating jets, and a
substantially weakened equatorial superrotating jet.
