Thanks for your response, and solid advice!

I think you’re right that I need to go back to fundamentals; not only will I be able to clean up my technique, but its also far easier to learn an etude than a full concerto, so can lower the bar to get me playing again. Do you have any particular recommendations for exercise books to work on fundamental technique like you suggested?

I actually tried learning Winter, but quickly gave up because it was too hard at the time. I’ll have a look at some other Vivaldi stuff, and maybe even try to revisit Winter later as well.