If you have a Smartphone or Tablet running Android download the free 'Torque' app and buy a Bluetooth OBD2 adapter for a couple of quid on the Internet. Not MG specific but very useful and can also give you real-time info. Mine has been a great help solving problems on the TF, a diesel Picasso and a Suzuki 4x4!
On the TF it plugs into the OBD socket above the fuse box under the removable panel under the wheel - not sure on th F.
What's that black canvas thing behind the seats for?
I think its any car made after 1997 is fitted with odb2 anything prior is odb1 .
for the tf I bought an odb2 code reader for 15 quid its basic but a great tool . I can read codes check certain systems like 02 sensors etc and I can clear system faults and turn off engine manager light .. my local garage charges 50 quid just to plug it in read the fault code and clear it and turn the enginw management light off so its paid for itself 100 times over already