Asbestos sheet removal ??

I have just started renovating the ensuite in our house that was built in 1982/83. The walls (under tile) are lined with a compressed sheet board as shown in the pictures below.

I have looked for markings on the back but I cant see anything at at this stage. I removed a section but then started to get a bit suspicious that there might be a problem. I am not sure if this accounts for much but the pattern on the back 'dot dash' pattern rather than the golf ball dimples that I usually think of for asbestos. I am not sure if the photos below are clear but the board is the same patten as shown in this picture labelled Hardiflex http://asbestosremovalguide.com/wp-c...-hardiflex.jpg

I know that testing is the only sure fire way of confirming but does anyone have some pointers in this case. I am at the stage where I don't whether I should just don the PPE and remove the remainder of tiles and cover it all up or call in the professionals for a complete bathroom strip out. Some advice would be appreciated.

Thanks.