tesswebb: no problem on not seeing my post
I figured you were on the other side of the pond.
I'm wondering if it's maybe an oleo-mac? (a total guess)
I'm certainly not too familiar with the oleo-macs' nor the 'butlers' name brand.
sounds like it needs a bit of a fuel system cleaning and maybe a rebuild of the carb. it's quite easy, and we can talk you through the more challenging bits.
there's a lot of info and loads of very knowledgeable folks here that'll make it very easy to get that saw back up and running.