Yes, you heard right; only professionals are allowed to buy BTC ETP on LES, according to the UK Financial Conduct Authority. The main aim is to protect beginners or less experienced individuals from potential risks, which is why they allow only professional retailers. Here is the link

The OP is getting into the professional lineup, which I think is not suitable for him right now. Firstly, you cannot hold the actual Bitcoin, and secondly, there are higher fees and commissions from brokers, which cause high costs. Instead, he can buy it directly from exchanges and own it in a wallet. Moreover, the price is actual, and he doesn't have to pay any commissions or fees.