Drove the girlfriends car today and as I was half way down the road I lost nearly all power, it wasn't until I put the boot in and then the car came back to normal. Could it have been the TPS???

that is possible but how old are the spark plugs, i had my car lose abit of power only to find out it was the spark plugs, get them checked

new Spark plugs and coil pack and o2 sensor installed less than 1000kms ago