Has everyone applied for the new tax credits? They start in April and replace not only the existing WFTC and Disabled Persons Tax Credits but also the Children's Tax Credit. Currently the wage earner receives approximately £10 per week extra due to an adjustment of the tax code. This will stop in April and you will only get this payment if you apply for it. I think it will be paid to families earning anything up to about £58K. Families earning up to around £22K will also be entitled to additional money in Child Tax Credit or Working Tax Credit.
See www.inlandrevenue.gov.uk for more information. You can calculate your entitlement or apply on line.
And no, I don't work for them but I do think that everyone should get what they are entitled to. My form went in about a month ago