Aha, now I see Victoria where your such a perfect english comes from.
I don't know much as well. Last time when Muzichuk's from Canada visited their sister (my grandmother) was in late 80's in Ukraine. The way I tracked them in Canada comes from the bible presented to my grandfater and signed as (to Oleksiy(my granddad) from Fred(Frederic/Fedir), Punnichy, Saskachewan, Canada). Both passed their way already :( The whole story you already know from the link above.
Where about are you in UK if it's not secret? I've been to Greater London 10 years ago for short period (1 academic year), used to live in Ealing there. Get in touch and drop me some line to my e-mail please some day, when you'll have free minute. Looking forward to.
Sure if you want to.
Was nice to meet you and talk to you.
Kind regards, Oleksiy