After much faffing about and getting samba client error 22s, I felt the need to share this.
I was having problems mounting share VPN-MUSIC on my DD-WRT router at ip address 192.168.3.1, I had to change the offending line in /etc/fstab to
//192.168.3.1/VPN-Music /mnt/samba cifs guest,username=nobody,password=,iocharset=utf8,sec=ntlm,nofail,vers=1.0 0 0
The key parameter here is vers=1.0 which will cater for older shares.
I hope this will save someone some time.
Jason