I now have my Raspberry Pi hanging off my router – just two cables – a USB cable to the USB port on the router for power and one ethernet cable.
1. Static IP Address
I edited the file: /etc/network/interfaces replacing:
iface eth0 inet dhcp
with
iface eth0 inet static address 192.168.1.51
netmask 255.255.255.0
gateway 192.168.1.1
So that my Pi would be available at a static address. I then configured my TalkTalk Huawei HG533 to forward requests on the external interface port 60 to internal port 22 on 192.168.1.51 (the Pi). 
So SSHing to the public IP address port 60 would bring me to my Pi.
2. Dynamic DNS
Since my ISP IP address changes frequently for a domain name I used no-ip.com. I could not install the noip2 client on the Pi as described here under the Ubuntu 12.04 LTS section as the no-ip2 package is not in the repositories. So I carried on to the manual install and downloaded as instructed I installed and then entered my details as shown below:
make install
gcc -Wall -g -Dlinux -DPREFIX=\"/usr/local\" noip2.c -o noip2 noip2.c: In function ‘dynamic_update’: noip2.c:1595:6: warning: variable ‘i’ set but not used [-Wunused-but-set-variable] noip2.c: In function ‘domains’: noip2.c:1826:13: warning: variable ‘x’ set but not used [-Wunused-but-set-variable] noip2.c: In function ‘hosts’: noip2.c:1838:20: warning: variable ‘y’ set but not used [-Wunused-but-set-variable] if [ ! -d /usr/local/bin ]; then mkdir -p /usr/local/bin;fi if [ ! -d /usr/local/etc ]; then mkdir -p /usr/local/etc;fi cp noip2 /usr/local/bin/noip2 /usr/local/bin/noip2 -C -c /tmp/no-ip2.conf Auto configuration for Linux client of no-ip.com.
Please enter the login/email string for no-ip.com redbranch
Please enter the password for user 'redbranch' ********
Only one host [hiddentoprotecttheinnocent.no-ip.org] is registered to this account. It will be used.
Please enter an update interval:[30]
Do you wish to run something at successful update?[N] (y/N) N
New configuration file '/tmp/no-ip2.conf' created.
mv /tmp/no-ip2.conf /usr/local/etc/no-ip2.conf
Now I can run commands against my no-ip domain name e.g.
ssh -p 60 hiddentoprotecttheinnocent.no-ip.org
nslookup hiddentoprotecttheinnocent.no-ip.org
