Broker for buying US shares

[Mahogany]

Good evening all,

Which brokers do you use to buy US shares? All of my holdings are with Hargreaves Lansdown and I'd use them (I have a valid W-8BEN) but I have no idea what the exchange rate would be.

From HL:
"This stock is quoted and traded in US Dollars. When you deal, the total value will be converted into sterling by the market maker we place your deal with. "

Thanks