1998 S8 part it off or sell it whole?

[Straycat]

My 98 S8 is past its sell by date I think?
It has done 256220 miles but is still in a really great condition all the leather is in fantastic condition carpets are as new in fact the car is no way like I would expect a 256000 mile car to look inside or out, There are a few problems with it on the running side though,
there is a leak on the steering somewhere, the air-bag light is on, (been told its a resistor under the seat?) the cruse control doesn't work, and neither does the rear parking sensor, There is also a issue that kills the battery vey quickly especially in the cold weather, (battery is only 1 year old)

Now I am wondering if it will bring me more money to sell it out as parts or not as I don't have never ending pockets to put the wrongs-right.
I reckon I will be looking at a bill of at least £1000 for the steering alone, but don't think the car would sell for more than £2500 with a full MOT and TAX anyway??????
Your views will be more than welcome
Cheers
Mick