The Trinity in the OT, the Faith of OT Believers, the Angel of the Lord

A number of years ago there was a lot of debate in certain circles in the UK revolving around these topics: the degree to which Christ/the Trinity is explicitly present in the OT; the nature of the Angel of the Lord; relatedly the object of believers’ faith in the OT (did OT saints trust consciously and explicitly in the Son?); the degree to which revelation is progressive from the OT to the NT. A lot of these threads were explored in the Blackham-Goldsworthy debate: http://www.theologian.org.uk/bible/blackham.html
What are your views on these topics? Some more specific questions might be:
– Does the OT, read on its own terms, clearly present a unipersonal God or a binitatian/Trinitarian God? Or does it murkily present the latter?
– How were OT believers saved? Through explicit faith in the Son, or through other means?
– Who is the Angel of the Lord?

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