I'd say you were about 50/50 to get an unconditional but as Paco says, if it's a conditional it won't be anything more than a B so just pick an easy Higher.
From past experience, I'm sure Strathclyde demands 3 A's and a B for the course I applied to and they gave me an unconditional without the B.
Anyway, I'm going to Uni
Dundee University to study Politics and History next month. I can't wait!