I really dislike the term economically inactive too, and my work sounds like it might be in a similar field to sooty's. In Ireland, the role of the stay at home parent (assumed to be a woman, granted, but still) gets a mention in the constitution!! The unpaid army. It isn't phrased like that but however it's worded, there is an acknowledgement that this uunpaid army must have pension rights, children's allowance, access to services, health care, state run courses etc...
The theory is one thing and the execution is another mind you. But given that the FAMILY is known to be a more successful economic unit, then to unfairly brand one half of what is a TEAM "economically inactive" when it was a team decision who took what role is a bit goady in my opinion. Maybe not sooty's own personal goady but it is not a model that would motivate or inspire people's confidence if they were out of the workplace for a long time.
Also, if the UK social welfare system is anything like the Irish Department of Social protection then their first priority is not to motivate or inspire or recognise the efforts of those doing unpaid work which contributes to society. It is to number crunch, save money from one column, send a cost to another department. Too look good. To be seen to be making progress.
Recognising the obstacles to work, and recognising people's contribution to society is the last thing that is acknowledged, but failing to receive a tick in a box marked ''economically active'' does not mean that one isn't contributing economically. To save the 'team' (family) a big childcare bill is contributing economically to that 'team'.