I am thinking of purchasing some bitcoins which platform I can use? I am in united kingdom. also is their a pro tradder whom I can follow and replicate my investment?
I would go with Kraken or Coinbase. Both are long established and have faster payments for GBP now. Coinbase Pro, Coinbase's exchange, has lower fees than Coinbase
There are a million people out there claiming to be pro traders. It's impossible to tell who's an idiot and who's any good, and even the best wind up failing at some point. Most people would be better off buying and holding. If you do decide you want to trade spend a lot of time researching first. Don't jump straight into it.