BS5871 Part 1

[GrahamM]

It's all working fine, but we're moving, and it's come up on a report

Due to the size of the room, it would therefore be best to get someone to check it?

When appliance was installed it should have been tested as per the gas regulations & manufacturers instructions. If all tests are good your fire generally does not require purpose provided ventilation.
If unsure have a qualified gas engineer to test and make sure manufacturer instructions are to hand for Engineers reference.

 

[tamz]

It's all working fine, but we're moving, and it's come up on a report

Due to the size of the room, it would therefore be best to get someone to check it?

Alice most of the so called experts who do "reports" are clowns. Retrained from motorola or wherever else they were made redundant from before they decided to get into their game. Unfortunately for you through his lack of knowledge (the room size is irrelevant) he has now flagged something up which will require you to get it checked by an RGI.
Don't pay any more than £60 and happy new house when you get it :smile:

 

[AWheating]

As your selling up its advisable to get gas safety checks done on all fixed gas appliances with a gas certificate to prove all is correct and safe to use.