So Guys the wife wanted a golf after days of searching came up trumps
mk4 VW golf on a S Reg 70k on the clock 1.6 SE Perfect condition inside and out 2 lady owners full service history uptill 4k ago
I checked the usual stuff like coolant perfectly clear (red)
Dip stick oil was smooth and clean great!
Car drove perfectly the hour drive back
and fine the next day
now it dosnt always start first time or start and stall but then fine
she got the car on Tuesday this week
so had a look around took the oil filler cap off and saw this.
it was worst than this this was after I cleaned it a bit

So Cleaned and and the cap drove it down the dual carriage way and back about 15 mins
and it was still clear but the gunk I left in a little was now on the back of the filler cap as pictured below

soo not loosing coolant
not over heating
smells a bit of petrol but not if that makes sense?
anyone got any advice /help
greatly appreciated
Thanks Sam