How do you measure the utilisation rate of the teaching workforce? The two traditional measures have been class sizes and pupil teacher ratios or PTRs. More recently, a new measure of Pupil Adult Ratios or PARs has been introduced in order to incorporate the growing important of support staff in the life and work of schools.

For the lifetime of the Statistics of Education volumes based upon the census of the workforce taken each January, the PTRs were published by local authority for nursery, primary, secondary, special school sectors and an overall figure. This allow meaningful comparison between primary sectors in LAs with 11-16 secondary schools and those with Sixth Form Colleges. Small rural primary schools also didn’t affect the comparisons between schools.

With the coming of the School Workforce Census, in 2010, in what was a sensible move overall in terms of data collection, more data became available at the level of the individual school, but less by local authority. Since 2010, only overall PTRs for each local authority have been easy to abstract from the datasets. This has not been as useful as the former more nuanced datasets.

In passing, it is worth recalling that dealing with PTRs for more than 150 local authority areas can lead to mistakes, even if the data provided at the local authority level is 100% accurate, which it isn’t always. My first interaction with Hansard in the early 1980s was when a national list of PTRs appeared in answer to a written PQ with a mistake in the first local authority in the list, thus making all other figures wrong. These days it would be an easy talk to rectify the error. Then it wasn’t and I am sure that bound copies of Hansard still remain with the wrong data to trip up some future researchers, especially if the errata slip has become detached.

I think there was a mistake in Telford and Wrekin PTR in the 2010 first run of the School Workforce Census where a PTR of 25.0 was apparently recorded. Logic suggests it ought to have been somewhere in the range of 17.6-17.9.

In a later post I will discuss the differences in PTRs between different types of local authority; London; urban areas outside of London; the unitary authorities and the remaining shire counties. However, it is generally clear that across England the pressure of rising pupil numbers and the cash they bring through the funding model has not been able to offset the falls in pupil numbers in the secondary sector and the other pressures on school funding over the past few years.

Only 15 of the 154 local authorities don’t have a worse PTRS in the 2017 School Workforce Census than they recorded in the last of the former series collected in January 2010. Seven of those local authorities are in London and most of the remainder are authorities with significant areas of deprivation where the Pupil Premium may have helped funding in their schools.

Overall PTRS are still much better than a generation ago across much of England, but will that trend be reversed as secondary pupil numbers grow if demands on funding, and especially gross salary costs, outstrip funding increases?