List as of 09:15 hrs BST, LHR services. The number after the destination is Terminal 3 or Terminal 5, so the first entry below to BCN was from T3. The return aircraft sector will normally be cancelled, so BA473 BCN to LHR is also cancelled.
Note no cancellations so far from LCY and only one from LGW: BA2758 to AMS.
EDIT: I've counted 360 BA flights today, of which 10 are flights from yesterday that will now run, and there are 45 cancellations noted below. So the CFU below wasn't running, but it was the reinstated service from yesterday whereas today's service did depart. Broadly I'd say 40 cancellations out of 350 flights, so far.
Code:
BA0472 LHR BCN 3 06:15 Cancelled
BA0456 LHR MAD 5 06:20 Cancelled
BA0428 LHR AMS 5 06:40 Cancelled
BA0948 LHR MUC 5 06:55 Cancelled
BA0902 LHR FRA 5 07:05 Cancelled
BA0964 LHR HAM 5 07:10 Cancelled
BA9126 LHR CFU 5 07:10 Cancelled
BA0304 LHR CDG 5 07:15 Cancelled
BA0664 LHR LCA 5 07:15 Cancelled
BA0776 LHR ARN 5 07:20 Cancelled
BA0854 LHR PRG 3 07:35 Cancelled
BA0564 LHR LIN 5 07:35 Cancelled
BA0936 LHR DUS 5 07:35 Cancelled
BA0478 LHR BCN 3 07:40 Cancelled
BA0804 LHR BLL 5 07:45 Cancelled
BA0762 LHR OSL 5 07:45 Cancelled
BA0342 LHR NCE 5 07:50 Cancelled
BA0696 LHR VIE 3 07:55 Cancelled
BA1370 LHR MAN 5 08:00 Cancelled
BA9248 LHR FSC 5 08:00 Cancelled
BA9220 LHR KLX 5 08:00 Cancelled
BA0848 LHR ZAG 5 08:15 Cancelled
BA0540 LHR BLQ 5 08:15 Cancelled
BA0726 LHR GVA 5 08:20 Cancelled
BA0392 LHR BRU 5 08:25 Cancelled
BA9226 LHR LXS 5 08:25 Cancelled
BA0548 LHR FCO 5 08:30 Cancelled
BA0654 LHR CFU 5 08:35 Cancelled
BA0466 LHR BIO 3 08:35 Cancelled
BA0752 LHR BSL 5 08:35 Cancelled
BA0828 LHR DUB 5 08:50 Cancelled
BA1468 LHR INV 5 08:55 Cancelled
BA1438 LHR EDI 5 08:55 Cancelled
BA0576 LHR LIN 5 09:20 Cancelled
BA1326 LHR NCL 5 09:25 Cancelled
BA0728 LHR GVA 5 09:25 Cancelled
BA0346 LHR NCE 5 09:40 Cancelled
BA9130 LHR PVK 5 09:45 Cancelled
BA0862 LHR PRG 3 09:50 Cancelled
BA1310 LHR ABZ 5 09:55 Cancelled
BA1386 LHR MAN 5 09:55 Cancelled
BA0862 LHR PRG 3 09:50 Cancelled
BA0834 LHR DUB 5 10:35 Cancelled
BA0886 LHR OTP 5 10:55 Cancelled
BA9134 LHR PVK 5 11:20 Cancelled
I was a bit surprised that some domestic flights have run, e.g. the early LBA.
EDIT for 11:40 hrs British Summer Time, a few more cancellations to add:
Code:
BA0702 LHR VIE 3 11:35 Cancelled
BA0746 LHR SVG 5 11:50 Cancelled
BA0874 LHR BUD 3 12:50 Cancelled
BA0334 LHR ORY 5 12:55 Cancelled
BA1446 LHR EDI 5 13:05 Cancelled
BA0314 LHR CDG 5 13:25 Cancelled
BA0766 LHR OSL 5 13:25 Cancelled
BA0374 LHR TLS 5 14:00 Cancelled
BA0460 LHR MAD 5 14:05 Cancelled
BA0830 LHR DUB 5 14:15 Cancelled
BA0556 LHR FCO 5 14:20 Cancelled
BA1312 LHR ABZ 5 14:25 Cancelled
BA0354 LHR NCE 5 14:30 Cancelled
BA0542 LHR BLQ 5 14:55 Cancelled
Update at 12:30 BST with some more cancellations for the afternoon and evening out of LHR.
Code:
BA0370 LHR MRS 3 17:10 Cancelled
BA0944 LHR DUS 5 17:25 Cancelled
BA0978 LHR HAJ 5 17:35 Cancelled
BA0736 LHR GVA 5 17:40 Cancelled
BA0322 LHR CDG 5 18:00 Cancelled
BA1316 LHR ABZ 5 18:05 Cancelled
BA1420 LHR BHD 5 18:05 Cancelled
BA0442 LHR AMS 5 18:05 Cancelled
BA0418 LHR LUX 3 18:10 Cancelled
BA1402 LHR MAN 5 18:10 Cancelled
BA1336 LHR NCL 5 18:15 Cancelled
BA1492 LHR GLA 5 18:15 Cancelled
BA1458 LHR EDI 5 18:30 Cancelled
BA0838 LHR DUB 5 18:45 Cancelled
So that's about 73 flights cancelled out of approx 350 scheduled flights.
Edit at 1445: new cancellation to OTP, making 74 in all. BA884 departing 18:55
Edit at 1920: 15 further cancellations for the rest of the evening, brings us to 89 flights.
Code:
BA1486 LHR GLA 5 18:55 Cancelled
BA0432 LHR AMS 5 19:00 Cancelled
BA0946 LHR DUS 5 19:05 Cancelled
BA1426 LHR BHD 5 19:20 Cancelled
BA0444 LHR AMS 5 19:40 Cancelled
BA0404 LHR BRU 5 19:40 Cancelled
BA0916 LHR FRA 5 19:40 Cancelled
BA0720 LHR ZRH 5 19:45 Cancelled
BA0738 LHR GVA 5 19:55 Cancelled
BA1462 LHR EDI 5 20:05 Cancelled
BA1404 LHR MAN 5 20:25 Cancelled
BA0958 LHR MUC 5 20:30 Cancelled
BA0326 LHR CDG 5 20:35 Cancelled
BA0582 LHR MXP 5 20:35 Cancelled
BA1318 LHR ABZ 5 21:00 Cancelled