Toyota Avensis car will not start.

Did your Kwik Fit " mechanic " LOAD test the battery or just check the battery voltage ?

Some two weeks ago the engine failed to turn over for the first time and I had to jump start it, well not a jump start, as I am parked on a hill I put it into 1st gear, whilst the clutch was dis-engaged, rolled the car down the hill to get up some speed and engaged the clutch and at the same time turned on the ignition, the engine started straight away. so the engine was running and I went straight to Kwik Fit not ten minutes drive away from me. Parked at Kwik Fit Service Station where the mechanic requested I turn off the engine, he then put the two battery tester leads across the terminals of the battery in situ' his battery tester gave a printed read out (which I don't have anymore) and he said that he couldn't find fault with the battery. He did ask me how long had the engine been running since the jump start and I told him less than 10mins which he then said the engine would have to be running approx 25-30mins to charge the battery up to full power.
I use my car daily generally for short trips and the last couple of weeks it has had mixed start ups, some sluggish, some straight away, until today when I had to resort to same "jump start" procedure.
PS
The battery is about 4 years old from new.

" the engine would have to be running approx 25-30mins to charge the battery up to full power." is total rubbish and you will never in a thousand years fully charge a flat battery doing that . If your battery has any weak cells it will not hold a charge .

Thanks for your help, I've just dug out the receipt for the battery I bought from Halfords, its dated Nov 2019 and cost £82 however I don't know how long the warranty lasts. I am going to Halfords tomorrow to check it all out, so for now I'll sign out and let you know the out come at the weekend.

You could also get your alternator charging rate LOAD tested , simple 2 min check

Sorry its been a while since I should have replied, however the problem has now been solved and rectified. The starter motor had packed in. A big clue to suspecting the cause was that the battery was not faulty as it had been checked twice and proved to be in good condition, and the car would only start with a push and not jump leads. Jump leads would not have stared the car as proved when I took it to Halfords.
Hope this acts as a pointer to anyone else in the same predicament.

Thanks for updating the forum

I had a very similar problem with my 2002 Clio 1.2. One morning about 2 weeks ago, I went to start it and no response. No starter motor activating, but the red immobilizer light flashing. Tried all ways fiddling with the key fob as suggested on many YT sites. I had a jump start from a neighbour in case the 2 year old battery was flat, but not a peep. Convinced my immobilizer was playing up, I was in despair. Not being able to move the car as it was facing uphill, I went to see the mechanic at my local repair garage who asked me to leave the key with him and he will take a look when he is able. 2 days later he and a co mechanic turned up, shoved the car away from other parked cars and pushed it back end first down the narrow street. That was 10.15 am. Two hours later he called to say the car was ready to be picked up. The starter motor had had it and was replaced. Total cost inc. time and labour was £174. I had told him when handing over the key, that when it was turned to ignition position, there was a distinct click that sounded as if it came from the passenger dash. He had bump started it down the hill in reverse btw.

No disrespect intended but if you have an immobiliser fault and light flashing , replacing the starter is not the cure for that fault . Glad replacing your starter cured your non start .