cgtcalculator.com – GOOD most popular site – untick apply rounding for HMRC-compatible numbers.
lategenxer – OK seems to give similar results for cgtcalculator.com type data.
ctgcalc galloway – OK expects BUY or SELL (not B or S) in capitals and only one column at the end for costs. Gives similar results to cgtcalculator when apply rounding is ticked.
Taxing 212 – ??? did not seem to parse three .csv files correctly.
UK Tax Calculator – ??? seemed to produce rubbish results.