The point is that if you had enough capital to trade without leverage, you wouldn’t be using a counterparty broker anyway: you’d be using a direct market access broker.
Unless you’re envisaging opening a very large account, the answer to your question is effectively “No, you won’t be able to do that”.
Note, also, that the leverage figures quoted within accounts are often variable, and that just because a “broker” (i.e. counterparty) offers “200/1 leverage” doesn’t usually mean that you have to use that much leverage. Choose a broker that allows you to adjust it to whatever leverage you want to use.
High leverage in itself isn’t dangerous. It’s the way inexperienced traders use it, combined with their poor understanding and unrealistic expectations and lack of risk-management skills that causes them the problems. But still, in general, it’s a good idea to steer clear of “brokers” offering ridiculously high leverage, for exactly the same reason that you should avoid “brokers” who offer deposit bonuses and competitions: it tells you specifically what kind of customers they’re trying to attract, and that in turn tells you enough about the way they do business to know that they should be avoided.
(Whether Barclays Capital trades with or without leverage isn’t relevant to what you needed to know, here. ).