Step 1 would be establish exactly what you're studying. I say that you say you're doing one A level (which is presumably Economics) and two BTECs, but there is no such thing as a BTEC in Financial Study. So this is either a BTEC in some other subject (perhaps Enterprise and Entrepreneurship?) or it isn't actually a BTEC at all (perhaps a LIBF Level 3 Diploma in Financial Studies?).
The same goes for your "Double Award in Business". What you probably mean is a "Pearson BTEC Level 3 National Diploma in Business", which is equivalent to two A levels.
Whilst colleges are often very casual with the terminology they use for the qualifications they offer, universities are not. Many (but not all) universities are perfectly happy to accept BTECs in lieu of A levels, but are often less keen on other "similar" qualifications. Some will accept a LIBF Level 3 Diploma, but some will not, for example. So unless you know exactly what qualifications you're studying, nobody can offer accurate advice as to how likely those qualifications are to be accepted by universities.