[Plugin: BackUpWordPress] syntax error, unexpected T_PAAMAYIM_NEKUDOTAYIM interface.php line 181

Yep, just delete the whole backupwordpress plugin folder, or rename it and then your site will come back.

so do I then re-install the pluging and re-set all my details etc ?

Ok, I did this – thanks for your help. Bit freaky for a wordpress noob like me ??