Having read through the last few posts about the safety of the Rojak and the lack of endorsement by the HSE for it's use and then to quote various methods sited by the HSE is a bit odd, tying the ladder has no specific endorsement of the type and diameter of the rope or even the type of knots that must be used or whether the ladder lashing points if they are eyebolts should be regularly pull tested with an approved device
I doubt the HSE would specifically endorse any safety device as should an injury occur during the use of that device it would seriously compromise the HSE's ability to impartially investigate and ultimately prosecute if an incident caused a severe injury or death
As with all safety systems it is the operatives responsibility carry out a risk assessment on site to ensure they are suitable for the task to use them in the correct manor as advised by the manufacturer, personaly I have used the Rojak since it's early days without any problems at times I have tried to find it's absolute limitations and not found a surface that it fails on yet, am I bothered there is no HSE endorsement NO I'll carry on using it while I can still climb ladders