Most B&Q fans have the arrangement you describe as they can be fitted with a
remote control .
What you need to decide is how you want the fan to work.
1 light switch controls power to both fan and light (fan cords then turn off
or on fan and lights.)
2 light switch controls fan lights but fan works all the time from pull
3 light switch controls fan but fan lights work all the time controlled by
(You get the idea I hope)
Firstly make sure you fix the fan bracket firmly into the joist (not the
laths) use inch and a half No 8 or No10 woodscrew minimum; longer if plaster
Now for the wiring.
The system you describe is common and consists of 3 off 2 core and earth
these are :- power in .. power out .. switch wire.
They are connected as follows :-
power in red to power out red and switch wire red. (usually in the centre
terminals of the rose.)
Power in black to power out black and lamp holder neutral (blue or black)
Switch wire black (should really be a twin red cable but from you posts
seems they have used a red/black )to lamp holder brown or red.
3 bare copper earths sheathed in green sleaving connected together in earth
Your fan should have a connector block with 4 terminals marked earth ;
negative ; live fan ; live light.
If the light kit is separate (you have to screw it onto the fan) then you
will only have 3 cables in the block and there will be a cable loose marked
Cable colours on these fans varies and I have seen all colours used from
purple to white.But whatever colours are used they are always marked.
To connect simply connect the negative fan connection to the 2 black wires
of the ceiling rose.
The earth to the bare copper earth wires.
Now decide what you want the wall switch to do....
Remember whatever you connect to this will only work when the light switch
is turned on.
When decided connect the appropriate wire (or wires) to the single black
wire of the ceiling rose.
(the one with the lamp holder brown wire)
Should you have decided to have a permanent supply connect the remaining
wire (fan /light) to the 3 reds joined together.
NB It goes without saying that you have turned of the power at the mains
HTH and good luck