No Initial Service, No maintneance!!!.
As all British Standards are recommendations or best practice the RR(FS)O is Law.
RR(FS)O states.
Maintenance
17. —(1) Where necessary in order to safeguard the safety of relevant persons the responsible person must ensure that the premises and any facilities, equipment and devices provided in respect of the premises under this Order or, subject to paragraph (6), under any other enactment, including any enactment repealed or revoked by this Order, are subject to a suitable system of maintenance and are maintained in an efficient state, in efficient working order and in good repair.
Also I have yet to find a commercial fire extinguisher manufacture that state their equipment does not require initial service or on going maintenance. In a court of Law manufactures requirements is a very strong bit of evidence .
I think its a even more brave person who states no maintenance of what is a pressurised vessel (fire extinguisher). I have heard in the new BS5306 standard they are looking at bringing in initial service as part of the standard.
Have a look at the story below, I know its in the USA but its the only one I could find quickly.
Apartment fire: Improper inspection of fire extinguishers: Fire code violations: Wrongful deaths: Burns: Settlement.
Edwards v. Dalcor Management, Ala., Mobile County Cir. Ct., No. 98-001595, Dec. 1, 1999. Edwards, 30, lived with her son, 6, and daughter, 4, in an apartment complex. Early one morning, Edwards's son set fire to a couch while his mother and sister were still asleep upstairs. He alerted Edwards, who tried unsuccessfully to extinguish the fire with water. She then brought a fire extinguisher into the apartment but was unable to remove the pin. The fire spread quickly, and Edwards was unable to rescue her children, who died in the fire. They are survived by their mother. Edwards suffered minor bums. Her medical expenses were about $8,000.
Edwards, individually and as mother of the children, sued the complex's management company, alleging state and federal fire code violations. Plaintiffs claimed that Edwards's inability to remove the pin from the fire extinguisher was due to lack of proper inspection and maintenance. Plaintiffs also claimed that the fire extinguishers in the building (1) were located at a greater distance from the apartment than required by the fire code and (2) were mounted higher than the fire code required. Plaintiffs claimed these factors increased the amount of time it took for Edwards to retrieve the fire extinguisher.
Defendant admitted to some fire code violations, but argued that Edwards's failure to remove the pin was due to her inexperience and panicked state.
The parties settled for about $2.13 million.