Pressure relief ball

[Nick Lettington]

To continue the pedantry I thought that 'they' is plural whereas 'he, she or it' is singular.

Thanks Robert. I stand corrected, hence my nervousness over punctuation! 

I  will write it out 100 times after class.

It's been a very long time.

Chris KC, I suspect it is an ageless tradition. I don't remember the master's name any more than he, she, it... but when I moved from Reading to Colchester,  my physics teacher set me the same piece of work that I'd done the term before in Reading. The new teacher had been a pupil of my former teacher Vic Payne some years previously and had kept the worksheet. It's a very small world!