Thanks so much for your help!
I am probably going to accept their offer, although the money is not quite what you suggested. However I am not joining Deloitte in England, but rather in another western European (EU) country.
Will heve to relocate 200 mls south, but still, I am being given a 40% raise compared to my current job.
I will try to negotiate a small incease in monthly salary in order to help with the travelling expenses +/- € 250.
Salary offered is € 35.000 gross/yr.