Senior Lecturer in Computer Science @UniOfExeter (optimisation, visualisation, water/offshore renewable energy engineering, maritime/ports). Ship photographer.

Joined October 2009
The replies to this post are the best thing I’ve seen on the internet this year. No exaggeration.
Bryony and Matt are spending £820,000 on a modern, high-performance home on the Cornish coast - designed to meet the highest environmental standards. Will they pull it off? 📺 NEW Grand Designs | Tonight, 9pm | Channel 4
1
138
David Walker retweeted
Bryony and Matt are spending £820,000 on a modern, high-performance home on the Cornish coast - designed to meet the highest environmental standards. Will they pull it off? 📺 NEW Grand Designs | Tonight, 9pm | Channel 4
1,027
318
590
2,771
5,780,209
David Walker retweeted
Desde Frías, Burgos, agradecidos con que nos encendieran el castillo para este momento único. – at Frías, España
48
1,344
56
7,334
165,826
David Walker retweeted
My small British company was bought by Americans. I have just been formally reprimanded for sarcasm and sardonic commentary. I told the disciplinary panel I was grateful for the opportunity to reflect on my attitude going forward and would be certain to bear it in mind in future.
84
173
16
9,897
449,140
David Walker retweeted
SUCCESS! Total Solar Eclipse 2026 from just outside the rural town of Duraton, Spain.
430
25,887
499
201,656
3,897,953
David Walker retweeted
Four years of planning the shots paid off. #EclipseEspaña #Eclipse – at Principality of Asturias, Spain
463
18,019
352
179,168
2,330,936
David Walker retweeted
How many of you seen this beautiful Solar Eclipse? This is so amazing 🤩
8
62
3
507
44,338
Returning to a document I started writing this morning. Never finish on "we will consider". Who only knows how that sentence would have ended...
549
Lovely weather for @Shieldhall arriving at Falmouth this afternoon.
5
633
Sheer incompetence from @GWRHelp. The 1625 Exeter St David’s - Plymouth is delayed by 22 mins. Platform staff said stay on platform for Teignmouth and not to get 1631 stopper, 1625 will get there first. 1625 now running to Plym direct, 7 mins after stopper left…
4
1
2
2,791
Impressively in numerous announcements to stop people boarding the wrong train nobody has apologised for the inconvenience. Incredible customer service.
1
685
David Walker retweeted
New paper with @zihao_chen_ out on the arXiv from @exetercompsci : a scalable framework for measuring how public transport actually performs — not just how it's supposed to using large scale data from @busopendata Link to paper here: arxiv.org/pdf/2603.11477
1
6
740
I’m in this boat. I must be tripping AI detectors all over the place…
Replying to @GregKamradt
I use em-dashes and colons all the time, sigh. AI is stealing our best punctuation marks. Who can we sue?
4
724
at a conference where you don’t have to present
86
845
117
15,135
677,311
Tomorrow night’s TV has a lot to live up to! #CelebrityTraitors #raceacrosstheworld
3
1,465
Just attempted to appear knowledgable by quoting Einstein. Sadly it's been (immediately) pointed out that I'm actually quoting Douglas Adams...
2
607
RIP Patricia Routledge.
66
1,049
53
8,737
333,669
I don't think I've ever agreed with something more than this...
All whiteboard markers should have a white body, and all permanent markers should have a black body.
2
621
David Walker retweeted
All whiteboard markers should have a white body, and all permanent markers should have a black body.
3
5
1
129
14,082
GCSE Results Day: Fears grow that Brits aren't picking up the basics as less students pass English, while over half (41.7%) fail Maths
294
228
106
5,334
355,920