Another update on this.

I have finally gained access to the wallet after Blockchain support changed the email to my current (this took over 30 emails)

So basically, the bitcoin has gone and there is a tiny amount of bitcoin cash left.

There appears to be no trace of the bitcoin but the bitcoin cash was transferred to another wallet in 2018. I can see the wallet ID that it was transferred.

it's as I expected as someone had obviously gained access to change the email.

Devastated, not sure if there is anything I can do?

I'm sure Blockchain will wash of their hands of this at this point.