Ok, the sync on bitcoin-qt would have taken forever so I downloaded Multibit. I attempted to import the key and something weird occured. The password it needed for my first password (I have 2 on the blockchain account) was actually the one I tried to upgrade to when Blockchain.info kicked me out the first time. However, trying to login to BC with that password results in "Error decrypting Wallet".

btw @Piuk - that must have been the error I was getting when I was kicked out - "Error decrypting Wallet"

Anyway - so now I've managed to successfully import to Multibit but it says "There were missing dates. Have to go back to Genesis block"

It says on the help screen that it could take up to 2 hours or more for this - but my current balance is at 0 and my new wallet doesn't look like it's been imported - on the left side it still has the one Multibit came with. Will this be amended when the blockchain is Synced? Also there is no progress bar so it's hard for me to tell if anything is actually happening.