Both Heathow Director and Barrow are Correct, but I have to qualify my statement
the recommended procedure will almost guarentee that you stay within the templated area.
though, sometimes we all get a little confused and 'aviating' is more important than accuracte pissy navigating: is to fly to the NAVAID then turn the shortest distance inbound to the 'non holding side' that's quick and dirty and should also keep you within protected airspace.
And, when it comes to a decision between 'teardrop' and 'parallel'
well ,...what's a few degrees of Track Error amongst friends
PA