The Cessna 150 is the perfect first aircraft and yes, the prices are coming down.
However, it tends to be the more tired ones that are going for sub £10k at the moment and when they are tired, they cost money. The £8k Annuals DO happen and are not just myths.
You won't get aircraft finance for a £10k machine. You need to be looking at £50k+ to be offered a deal by the Lombards of this world. Also, I personally wouldn't take out a personal loan for a luxury item in these times, especially for an item that might take some time to sell if you need to when the £8k annaul appears.
That said, I bought one when I was 20 and flew her for 300 hours back in 1993 to 1996. I learnd a lot in her and quite miss her actually.
The Canadian one above is a beauty but in that condition, you'd be looking at circa £17k even in this market.
Good luck