Reporting based on evidence is definitely allowed in the UK. Any accusation of libel/slander could be defended by producing the evidence and thus proving that the statements were true.

Going beyond the evidence and jumping straight to the crime is where the situation becomes tricky as the defense would be unlikely to prove beyond doubt that the accused person was actually guilty - that's why terms are used such as "alleged child abuser". Alternatively, the evidence/facts can be reported e.g. "Trump featured in many victim reports as an abuser".