So I got onto Liberty and they WILL take my one year named driving experience from February 2015-2016.
They said they take named driving experience as long as it's within the previous 2 years.
So the few months gap this year is not a problem and my cover since May 2016 makes no difference (as expected).
So we ran through the quote again and with the above details, now including one year named driving experience and with 2 siblings named (full licenses, driving c. 10+ years, no claims/points in past 3 years) the quotes are as above:
Comprehensive: €779
TPFP: €570 (+ €30 for optional windscreen/glass cover).
At those prices I would go for comprehensive.