I don't want to come off as being sassy (because I'm not intending to sound that way) but have you been following @poisonivy's trip report? It sounds like she, her husband and son as well as others on the trip loved it! Anyway, her tr is very thorough and answers AT LOT of questions (although she flew from the East Coast).
https://disboards.com/threads/disney-magic-12-nt-british-isles-cruise-2017.3623371/
Last year my family and I did the Dover to Barcelona cruise and it was our first
DCL in Europe. We loved it. Hang the cost, the experience was wonderful. Just my 2 cents

I'd love to do the BI cruise as well...and the Baltic...and the Iceland...and yep, all of them!