Here is a link for pictures and stats for RFA Reliance (A131), already talked about there is a really good picture here too
http://www.navypedia.org/ships/uk/br...astronomer.htm
Other examples of ships like this are:
RFA Argus (A135) of the Royal Fleet Auxiliary which began her career as container ship. The ship was requisitioned in 1982 for service in the Falklands War and purchased outright in 1984 for use as an Aviation Training Ship
RFA Engadine (K08) was a helicopter support ship of the Royal Fleet Auxiliary. The need for Engadine was seen in the mid-1960s as more and more helicopters were deployed from Royal Navy aircraft carriers and surface combatants. She was decommissioned in 1989 and sold to new owners in Greece and left the UK in 1990. Broken up in India in 1996