I wish I lived in the part of the UK where you can buy chicken at £3 a kilo or a steak for £6! The price of a lot of things depends on what quality you like. Yes you can eat out on a budget if you like cheap pub grub..pie & chips(frozen), scampi & chips, lasagne etc and pay less than a tenner, but if you don't want typical pub grub...which to be fair..a lot of pubs do, then you'll pay for it. Average around £13 to £18 for main, £15 for a bottle of wine and this isn't including starters..average £5 to £6 and desert...same again. There are cheap places to eat but they're cheap for a reason. Clothing is cheap if you like to shop at primark, matalan, asda and the like but if you don't...you'll pay for it.
I work in retail and our average price for a skirt/top is around £40ish, dress £55 and men's shirts £50, so comparible to prices in say Country Road in Oz. Imo the quality is worse here for the price and I find this a lot with clothing in the UK unless you pay a lot more. Retail in the UK is suffering and has been for quite a while now. Obviously the weather hasn't helped trade right now. People just don't to seem to be spending and as a lot of shops are offering discounts left right and centre, people don't want to pay full price. They'll wait for sales or the chance a discount may arise...human nature, but unfortunately it effects trade and the knock on effect is reduced hours for staff and job losses. I don't believe the day to day living costs are much different between Oz and UK when you weigh it all up.
One of the things I see crop up a lot is how cheap it is to travel to Europe, flights for £39.99 etc. Not in my experience! If you do manage to get a great deal it usually involves travelling at night, arriving late at night and leaving in the middle of the night to come home. This may be ok if you're retired or not having to worry about work and can afford to spend £600 plus on a couple of nights away.
Lets be realistic about prices in the UK, it's cheap if you like cheap...but you'll pay for quality...simple.