500k to start a business/or buy a turnkey

Good evening i am a 25 year old and have done fairly well with property in the uk. I have money tied up investments but have 500k aed spare and wanting to start a business up or buy a turnkey Ive seen some mobile car detailing company’s for sale that interest me. Boring money can be long term money.

Anyway if anybody wants a business partner and has a business idea / plan to present to me we can jump on a call whenever.

I have 9 years worth of experience in construction in the UK but can put my mind to a lot of things.