It sets about the lowest bar of aspiration that a strapline possibly could. Future extensions presumably include We will drag ourselves into work today and We can be arsed to answer your phone call.
You can imagine the defence the client would put up. 'It's exactly right. We really do bother to help people, unlike all those other can't-be-bothered companies that the public hate.' On a rational level, that's entirely fair enough. But, subconsciously, lines like these plant the very negative thought that they are trying to dispel. 'Oh, that's great that you can be bothered. It actually hadn't occurred to me that you couldn't. That's quite a worrying thought, now I think about it.'
Being bothered is about the minimum you would expect from a business – a step or two beyond We will fit a front door on our office. More worryingly, you're implying that any customer phoning up for a quote is actually bothering you – it's just that you're OK with it.
Still, in a world where companies are forever delighting customers, striving for excellence and exceeding expectations, there's something quite heartwarming about a line like this. Like I say, only in Britain.