No. The largest unsecured loan available on the high street is £50k, repayment is over 7/8 years with payments of around £700 a month starting immediately.
Larger loan products are available but only as secured lending - which is done using housing/property.
There are no large loan products that let you borrow a large sum of money just with a guarantor. The lender will want a cast iron guarantee they'll get their money back which is why it's secured on a home.
My question to you is, if you are taking out a large loan product how are you going to pay for it each month? My next question would be, if you can afford payments of £700+ a month from day 1 then why not spend that money on training directly instead of taking a loan?