Thank you @foxhole. All that sort of information helps us on forums such as this. In actual fact the Head Gardener has informed me that she has ordered this for me to use : https://www.amazon.co.uk/Chainsaw-Compatible-Batteries-Brushless-Lubricator/dp/B0D93D375Z?th=1 I liked the idea for tightening the chain. The usual method is a bit fiddly on these mini saws. And it has got a bar oiler which I like.I managed to find a recip blade for my saw which was over 300 mm long, but unfortunately the extra strain of a long blade meant it snapped very quickly at the fixing point.
But apparently I have to wait until Father Christmas brings it down the chimney on the night of the 24th of this month.
But a sincere thank you to everyone who has contributed to my topic and query. I've learnt a lot about other saws. Thank you and a very Happy Christmas to you all.

