Lone parents work in just as wide a range of roles as everyone else. However in an tough economic climate mothers wanting to return after maternity leave or unable to stay at the office till 8pm every night are amongst the most vulnerable to being "let go". This is well documented.
The loss of a man doesn't suddenly reduce you to stupid or incapable too! My existing CV wasn't wiped clean just because I had to parent alone. It just restricts your choices in a way that until it happens to you personally is VERY hard to imagine. However many lone parents can and do work in responsible well paid fields. When the household income rests solely on one person's shoulders the incentive to work is always there.
Being able to self-select a volunteer role that will enhance your existing skills and experience is yet another example of the risk taking I referred to higher up the thread that is not permitted for single parents on welfare. There is no point in a midwife, management consultant or accountant doing workfare, but both could offer the charity sector real, much needed assistance, creating a win-win for organisations, charities, families and society as a whole.
There are so many Mums I've met who if only they could have the security to give it a go would together comprise that desperately engine of small business growth and innovation that historically has dragged this nation out of recession, time and time again. The current punative system means society instead of progressing, has begun to eat itself. That does none of us any favours.