Is there a way to force fsck to run at boot on an encrypted LVM drive?

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Could you please confirm if the correct way to do this is to add that option to the end of the line starting with 'linuxefi' after selecting the kernel and pressing 'e'? Because I am trying that and it doesn't do anything.

Yes, add it at the end of the line starting with linuxefi. It does work here, luks encrypted root.

This is the output from dmesg | grep 'fsck'

[ 0.000000] Command line: BOOTIMAGE=/vmlinuz-4.15.4-300.fc27.x8664 root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/root rd.luks.uuid=luks-2ef8e9f4-a691-4007-91d1-04d34cb4dd4f rd.lvm.lv=fedora/swap rhgb quiet LANG=enGB.UTF-8 fsck.mode=force [ 0.000000] Kernel command line: BOOTIMAGE=/vmlinuz-4.15.4-300.fc27.x8664 root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/root rd.luks.uuid=luks-2ef8e9f4-a691-4007-91d1-04d34cb4dd4f rd.lvm.lv=fedora/swap rhgb quiet LANG=enGB.UTF-8 fsck.mode=force

[ 29.607230] audit: type=1130 audit(1519478361.606:19): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel msg='unit=systemd-fsck-root comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'

Does that mean fsck took place? Nothing else obvious shows in the dmesg log