The current weather conditions have spread the ash from Grimsvotn over parts of the UK airspace and as a consequence there are some delays being seen. The current height of the eruptive plume is at ~5 km. The figure below shows the projected position of the ash cloud at 0600, 1200, 1800 and midnight tonight. For today and probably tomorrow there will be significant delays to flights as many airlines will not want to take the risk. Whether there will be further disruption off into the future is more difficult to tell.
I am currently studying volcanology in the UK and want to share this interest with others.