help desperatley needed

[uksaint]

ok
First off thanks guys for all the help
1) had the car for about a month
2) Never noticed any white smoke on tick over had a little when I kicked down hard but with 105k on the clock thought this was acceptable
3) When the mechanic changed the starter motor he said that I should get a refund on the one that was fitted because it looked nearly new
4) The first time it let me down it had been sitting idle all night that when it went in for the starter motor
5) The second time the car had been back from the shop 2 days had not been used my wife then drove it 5 miles pick me up and failed.
5) Each time it let me down there was virtualy no noise just a click engine did not turn over at all.
6) When it went back to the shop this time they did nothing to it put a jumper on it and it started.
7) They left it overnight and it started fine the next morning.
8) They did say that on one of the occasions when it started it filled the garage with white smoke. They took it for a drive and it cleared
9) When I picked it up it started on the button drove down the road white smoke billowed out for 30 seconds then was ok.
10) When I got it home (about 2 miles) very strong smell of diesel
11) Left it a couple of hours then it started on the button again no smell
I am a convert from a 7 series I love the car but I do not know where to go next
Thanks in advance
Mark
Sorry guys tried to put a pic of the car in but no luck will try latter