I couldn't pass this thread by without offering some comments because we where in your position this time last year.
We too had our attendance unconfirmed because I had attended different worship services sometimes with and sometimes without my children.
The clergy reference form supplied by the school asked for 'the confirmation that the parent's of child X have worshiped regularly' in this case once per month for a year prior to application. But I found that our church confirmed that they used only the sunday school child's register to measure the required attendance. This was not mentioned in any published material by the church, school or in the admissions booklet.
I approached the vicar and although very sypathetic seemed to suggest their hands where tied and it was not their decision. The school confirmed they could only act on the information supplied by the church. The head of education at our Diocese did not return my calls or emails asking for some clarification on diocese guidelines relating to the recording of church attendance for school admission purposes.
To make things worse we already had our DS in year one and lived over 2 miles from the next 3 schools, two always over subscribed. Sibling priority was only given in the school's oversubscription criteria if a clergy reference was supplied also.
We didn't get offered a place, at our 600m away school which my DS already attends or our second and third choices.
We had no option but to appeal. We outlined all of the above and lost. No reason is given in the outcome letter so we do not know for what reason the panel thought the practise of undisclosed recording methods was ok to continue. It took up 4 months of our lives this year.
What really upset me was the amount of other parents who told my stories of other churches in the town being too free and easy with clergy references, surely they should be working consistently ?
I hear now that our church has adopted a signing in system at the entrance for parents rather than a register in sunday school, something l suggested in my appeal, funny that.
In appealing we have not been popular with the headteacher , we have acted professionally at all times, she unfortunately has not. I walk into the school everyday with my head held high for my DS, I know we did the right thing, but l would not want anyone else to go through the same.
So you must pursue this at every angle before you get to the deadline for applications. Get onto the Vicar, Diocese, Headteacher, Local Ed Admissions Dept and anyone else you can think of. Goodluck