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The BUGB is pretty liberal and there are many things on which it does not have a clear view. To that extent, I would guess it's a bit more like the American Baptists than the Southern Baptists who, from my transatlantic vantage point, appear to be more evangelical in their doctrine, generally.
Though there are some evangelical Baptist churches still within the BUGB, a large proportion of UK churches which bear the name "Baptist" are in fact either independent (in some cases affiliated with other independent churches through organisations such as Affinity, the Fellowship of Independent Evangelical Churches [FIEC] or the Evangelical Movement of Wales) or part of other Baptist denominations such as the Grace Baptists.
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In my lengthy experience, the BUGB is not liberal, although it is not prescriptive on certain matters and certainly not judgmental over issues that seem to overoccupy the public outbursts of certain preachers in the US. Every church in the BUGB with which I have been involved - and there have been many - has been evangelical, highly committed to missionary support and not independent. However, the Union is a 'broad church' including churches which clearly believe in a separate Baptism by the Holy Spirit and those who believe in water baptism resulting from conviction through baptism by the Holy Spirit, churches which are charismatic and those which are more conservative. Check out their website for info on their principles - principles which every aspiring minister/pastor is asked about before being confirmed as eligible to lead a church.