Bit help if possible guys..

Pins can be bought at your local BMW dealer - dunno what the cost will be.
Electrical problems sound like a bad earth or a poor connection. Check the cables where they go through the main bulkhead via a plug and socket. Often the earth cable between the engine and the chassis can cause problems if it works loose. Bad earthing  can cause lots of problems.

If the electric steering wheel adjuster stops working, you will usually find that the driver's seat also does not work. Thats caused by the seat plug that connects to the switches has come loose. many faults can be solved by undoing plug and socket connections and cleaning them with a good electrical cleaning fluid - not WD 40 - that's good for lubricating as a light oil, but not for electrical connections.

Other than spending money at an auto electricians, that is all I can suggest.
I am on my third E38 since 2000, with over 200K miles driven. Only major problem I have had is that the standard front springs keep breaking. I fitted Alpina springs and suspension and had no further problems. The latest one is a sport, fitted with MPower springs. I have had no reports of troubles with these springs. Brakes last 40K between pads and 80K or more  between disks. Handbrake release pulls last about 30K miles and can be a sod if they break with the brakes on, so keep a pair of long nosed pliers so that you can pull the wire to release the handbrake. If you are over 13 stone in weight, the odds are that the plastic seat side will break - I always have the heaviest cart at the go cart track, so my seat sides need replacement every two years or so. They come in pairs for some reason, so I have a passenger seat one spare in grey.
Apart from that the fuel cost can be excessive. If you are going to do 20K miles a year in the car for a few years, convert it to LPG. It will run better than it will on petrol, but use about 8% more. Overall saving about 40%, which is a lot!

Have fun.