Play in bottom bracket

[Jimmy Welch]

Just as a footnote to this would this play in BB cause a few chain drop outs , my mate experienced the chain coming off a couple of times , and I'm hoping the BB movement would be behind this

 

[Cycleops]

Like I said you'll only know when you remove it

 

[Ajax Bay]

would this play in BB cause a few chain drop outs , my mate experienced the chain coming off a couple of times , and I'm hoping the BB movement would be behind this

Yes, quite likely, if the chain dropped inside or outside the chainrings, probably during shifting.