This lovely surprise was left by a previous owner.
Is it able to be fixed without removing the gearbox?
Unfortunately I will need someone else to carry out the repair, any suggestions?
 
 

should be able to affix something over the top without removing gearbox. perhaps rivet or screw a fabricated box over it rather than weld
JP

Another alternative would be to fit a rubber gearshift boot over it and screw or pop rivet it in place. Are you going to put a console in place at some time? If not then some of the late model focus gearshift boots are fairly big and may cover it.
 
Len

Did it come with the celica / supra gear box?  The irony is that the tunnel didn't need cutting judging by the extension housing.
 
Matt 

Matt, the car came fitted with a Toyota W50 gearbox that I have had rebuilt.
The tunnel has been replaced with one like this

The installation/welding of the tunnel looks quite neat so its surprising such a poor job was done cutting the hole.
I have a boot that covers the hole nicely and plan to re-carpet the car so aesthetically its not an issue, it just bugs me because the rest of the car is so nice.

Maybe cut a piece of ally out neatly and rivet it,