Hi,

A thousand thank you´s. It worked. 

It took me a while as I was imputing the files in the wrong way not using spaces. I used the btcrecover tokenlist and just broke the tokens up into smaller parts and it did it really quickly. The password was just a slightly different combination of what I was trying... Gave me the password that I then ran on the multibit decrypt.py and it pumped out the keys for me, super happy.

To check I tried the password on in the Multibit Classic wallet on exporting the keys and guess what......? Password worked! The exported keys match the ones from the python decrypt.

So my Multibit wallet was NOT corrupted my password was just slightly wrong, lesson learnt not to forget a password even if I don´t use them for years.
Lots more lessons learnt using python and code so that is a massive upside to this experience, also I am amazed how helpful this BTC community is. So thank you all!

Just one last question.
Should I just use the keys to transfer the wallet, I have a keepkey, as sending the BTC from Multibit Classic may be a problem with the fees as I have read in other posts.

I guess if the password is right I will try using the Multibit to Keepkey Utility.