Enter disk decryption passphrase error

[Fenellakw]

I'm going through this atm.  I've actually forgotten my disk password.

I'm sure you've noticed this already but just in case...

I realised on mine that the keyboard for entering the encryption passphrase on boot differs from the keyboard in use once it's fully booted.
The most notable difference is the Shift key - it actually works like a Caps-Lock.
Once you press it, everything you type from then on will be in uppercase until you press it again.

I didn't notice on my first few attempts and was trying to work out where I'd made a mistake in my phrase!
Grr.