Thanks, Will, for the comment and compliment
The thing about the 'tin whistle' is that ... it is really down to the technique.
Most professional whistle players use better quality instruments but, in the main, that is to do with tuning and stability issues. Mostly the tone and temperament come from the 'blowing, tongueing and fingering' skills.
If you do a little research you will find that a vast number of respected players use very cheap and readily available instruments. The main contenders are Clarke's, Walton's and Generation. I think the Generation ones are the most popular and most stable .... and very, very cheap
I'm afraid that I am sadly lacking in most of these attributes and, at this time, am almost on the verge of giving up the instrument pending major dental surgery within the next few weeks. I may possibly have to bin it completely.
Anyway, that is another story ... in the meantime, thanks again for the compliment, young man
James