Think hard about WHY anyone need you to do this if it were legit? Do you not think if it were legit that someone would have started a business offering whatever service this is for less than £15k a pop? Why you? Why such a massive commission?

This is almost certainly either (a) someone using you as a money mule to launder the proceeds of crime - bad for you, you could have access to banking cut off and/or get a criminal record, (b) someone scamming you - bad for your because you're going to lose money somehow or (c) AT BEST you are helping someone illegally evade tax. My money is on option (a) from what you've said.

You wil almost certainly be investigated by your bank if a six figure sum drops in and goes out quickly minus a commission, especially if that isn't consistent with your income/wealth. They will then pass it on the he police if they think anything untoward is happening.

It might be that your friend is ALSO being scammed/doesn't understand the criminal implications so trusting them isn't enough.

I would really advise you to stay the hell away from this one.