2019 November 4: Update on the items below: due to a delay in delivery of part of WEAVE, part of 2020A has been returned to science.

2019 May 28: Update on the item below: due to a delay in delivery of part of WEAVE, ~ 3 months of 2019B has been returned to science.

2019 February: In 2019B, the amount of time available for observing with the WHT will be very restricted, due to the upcoming assembly, integration and on-sky commissioning of the new MOS fibre spectrograph WEAVE from 2 September 2019 until spring 2020. The remaining 2019B nights, August 1 - September 1, will be used to finish off existing high-priority science programmes requiring the current instrumentation. Recent information about the timescale of the developments under way at the WHT (and INT) can be found on the ING instrumentation-update pages.

2017 March: The lower dome shutter has been repaired. Observations at elevation < 25 deg will no longer be vignetted by the dome (plot).

2017 February: AF2 and the prime-focus imager (16-arcmin field) will not be available in 2017B.

2017 January: Vignetting at low elevation: the WHT lower dome shutter is currently stuck in a raised position, and observations at elevation < 25 deg will be vignetted (plot).

2016 September: AF2 will now be available during semester 2017A (INTEGRAL will not).

2016 February: AF2 and INTEGRAL will not be available after the end of 2016B, due to preparatory work for WEAVE (first light expected 2018).

2014 August: As a result of the ongoing rationalisation of instrumentation at the WHT, the adaptive-optics suite (NAOMI/INGRID, NAOMI/OASIS) will not be offered after 31 January 2015, i.e. from 2015A onwards.

2014 February: Azimuth oscillations fixed. These affected many nights during December 2013 - February 2014, but the problem has not been seen since February 24, following replacement of a failing component in the azimuth power amplifier.

2013 August: WHT lower dome shutter is now again operational.

2013 February: Differential tracking with autoguiding is now available, but is not compatible with some dither/nodding scripts (as often used with e.g. LIRIS). Observers interested in dithered, autoguided, observations of a moving target should contact ING.

2013 January: Vignetting at low elevation: the WHT lower dome shutter is currently (and probably until July 2013) out of action, and observations at elevation < 25 deg will be vignetted (plot).

2009 June: ACAM, the WHT's new Cassegrain imager/spectrograph, has successfully been commissioned on-sky.