As I expected, it has the feel of a boilerplate form letter. Here is the main paragraph:
I am very sorry to read that you find the television advertisements offensive. The characters in "Little Britain" are some of the most popular on British television, and using them for our new advertising campaign was not intended in any way to be discriminatory. We chose to work with David Walliams and Matt Lucas and the "Little Britain" concept because we believe that they can bring their highly successful brand to our advertising. However, we do appreciate that the advertisments are open to interpretation and personal taste, and we would like to apologise if any offence has been caused.I'm sure I would write something similar, were I a divisional director of corporate affairs at a building society whose profits have nosedived.
Looking a little wider, I am disappointed to see that Dru Marland's open letter to David Walliams seems to have suddenly become significantly less visible in the search engines than other comparable posts of hers. A quick comparison: search on the open letter vs. search on another post. The former search returns only pages that link to the post, the latter returns the post itself. Such manipulation of content visibility either by practitioners of a very specialist niche within the search engine optimisation world or by direct approach via legal channels to the search engine itself is something I am not unfamiliar with by virtue of the work I do for a living. That I see it here indicates that the point being made has reached its target and steps are being taken to limit any damage to the Little Britain brand. It strikes me that any such damage is self-inflicted.
EDIT: Sometime later on Saturday 5th of June, as if by magic Dru's open letter post reappeared at the top of the search on its title (See comment below). Google searches do not rearrange themselves in this way over these timescales without editorial intervention. It would thus be tempting to claim success as a 1337 search engine h4xx0r but that might be a bit presumptuous. Google doesn't change things for simple bloggers. However it would be extremely interesting from a tech perspective to know what the story was behind the post's disappearance and subsequent revival. I guess I'll never know.