Wikipedia DNS problem confined to Plusnet?

[#1]

Looks like WM are making DNS changes, but why those changes would be breaking things (and whose fault that is) is beyond my DNS-fu.

[#2]

Seems resolved for me now. Apols if I was too quick to point the finger at PN, but if two of PN's four DN servers, half a dozen non-PN servers and a host of friends on other ISPs could all see it, it was perhaps an understandable conclusion. 😉
aoakley@khepri:~$ date
Thu Jul 17 14:00:27 BST 2014
aoakley@khepri:~$ host en.wikipedia.org 212.159.13.49
Using domain server:
Name: 212.159.13.49
Address: 212.159.13.49#53
Aliases:
en.wikipedia.org is an alias for text-lb.wikimedia.org.
text-lb.wikimedia.org is an alias for text-lb.esams.wikimedia.org.
text-lb.esams.wikimedia.org has address 91.198.174.192
text-lb.esams.wikimedia.org has IPv6 address 2620:0:862:ed1a::1
aoakley@khepri:~$ host en.wikipedia.org 212.159.13.50
Using domain server:
Name: 212.159.13.50
Address: 212.159.13.50#53
Aliases:
en.wikipedia.org is an alias for wikipedia-lb.wikimedia.org.
wikipedia-lb.wikimedia.org is an alias for text-lb.esams.wikimedia.org.
text-lb.esams.wikimedia.org has address 91.198.174.192
text-lb.esams.wikimedia.org has IPv6 address 2620:0:862:ed1a::1
aoakley@khepri:~$ host en.wikipedia.org 212.159.6.9
Using domain server:
Name: 212.159.6.9
Address: 212.159.6.9#53
Aliases:
en.wikipedia.org is an alias for text-lb.wikimedia.org.
text-lb.wikimedia.org is an alias for text-lb.esams.wikimedia.org.
text-lb.esams.wikimedia.org has address 91.198.174.192
text-lb.esams.wikimedia.org has IPv6 address 2620:0:862:ed1a::1
aoakley@khepri:~$ host en.wikipedia.org 212.159.6.10
Using domain server:
Name: 212.159.6.10
Address: 212.159.6.10#53
Aliases:
en.wikipedia.org is an alias for text-lb.wikimedia.org.
text-lb.wikimedia.org is an alias for text-lb.esams.wikimedia.org.
text-lb.esams.wikimedia.org has address 91.198.174.192
text-lb.esams.wikimedia.org has IPv6 address 2620:0:862:ed1a::1
So are we going for dodgy DNS update by Wikimedia Foundation, half-bakery by DNS poisoning script kiddies, or black helicopters censoring the inter-tubes?