Bullion Vault deal only in gold and their costs are lower. It is possible to trade on their website as the spreads are quite low - if you feel lucky. They are also easier to open an account with, in my experience.
Though, I also have a Goldmoney account for silver.
I use Chards for coins. Others also use Bairds, ATSbullion and coininvestdirect.
I'm fairly new to all this. But am happy to know, that a real tangible asset belongs to me. Though the drops can be a wee bit scary.
Good luck,
BB