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Aims: Completing the poorly known substellar census of the solarneighbourhood, especially with respect to the coolest brown dwarfs, will leadto a better understanding of failed star formation processes and binarystatistics with different environmental conditions. Methods: Using UKIDSS dataand their cross-correlation with the SDSS, we searched for high proper motionmid- to late-T dwarf candidates with extremely blue near-infrared (J-K<0) andvery red optical-to-near-infrared (z-J>+2.5) colours. Results: With 11 newlyfound T dwarf candidates, the proper motions of which range between 100 and 800mas/yr, we increased the number of UKIDSS T dwarf discoveries by $\approx$30%.Large proper motions were also measured for six of eight previously knownT4.5-T9 dwarfs detected in our survey. All new candidates can be classified asT5-T9 dwarfs based on their colours. Two of these objects were found to becommon proper motion companions of Hipparcos stars with accurate parallaxes.The latter allow us to determine absolute magnitudes from which we classify Hip63510C as T7 and Hip 73786B as T6.5 dwarfs with an uncertainty of $\pm$1spectral subtype. The projected physical separation from their low-mass (M0.5and K5) primaries is in both cases about 1200 AU. One of the Hipparcos starshas already a known very low-mass star or brown dwarf companion on a closeastrometric orbit (Hip 63510B = Gl 494B). With distances of only 11.7 and 18.6pc, deduced from their primaries respectively for Hip 63510C and Hip 73786B,various follow-up observations can easily be carried out to study these coolbrown dwarfs in more detail and to compare their properties with those of thealready well-investigated primaries.

Hip 63510C, Hip 73786B, and nine new isolated high proper motion T dwarf candidates from UKIDSS DR6 and SDSS DR7