I was passing through FRAFCL yesterday, spoke to one of the lounge ladies who agreed with me that 55 min connection in ZRH is pushing it (she thinks even 1 hr 20 mins was a bit too much in light of delays on UK inbounds).
She said she will speak to ticketing, and if they can not fix it with LX try to rebook me via FRA on LH metal which is showing F7 A3 now (it was F8 A0 when I booked). Since LX and LH fares are the same and ticket is LH plated she says it should work. Since I had to leave she said she will fix and send me an email if she can't get me on the phone.
Let us see what happens.