If she's "only worried about our customers"...
Then why is she trying to minimise the breach:
Less than 1.2 million customer email addresses, names and phone numbers
That's 2-3% of the adult population of the UK, I'd say that was a significant breach.
As for the 15-20k poor beggars whose date of birth and bank account details have been spewed, that might be small number (of little people) for the Baroness, but it'd be quite a big crowd if they turned up at her office to have a word.
So, state of play on the past few months of data breaches in the UK:
TalkTalk = Incompetent wankers
Carphone Warehouse = Incompetent wankers
British Gas = Incompetent wankers
All other companies = ?