UK prices differ from north to south of the country you pay a lot more in the capital London.
Generally across rest of country;
There is not much difference in price to variety which makes most commercial growers go for the indica fast finishing varieties as you cannot get the extra price for the longer flowering hazes. Price differences are appearing in the market for different quality but its hard to compete now the electric trimming machines have become more popular for the bigger commercial outfits.
£10 - 0.8g
£20 - 1.4g
£35 - 1/8oz
£55 - 1/4oz
£100 - 1/2
£160 - £240 1oz quality dependant
£1000 - 5oz
£1800 - 10oz
£5400 - £7200 Kilo quality dependant
The electric trimmed stuff that looks like its been through a pollinator tumbler for 60 seconds is hitting the markets from the bigger commercial grows at £160 if you have the connections, but is no comparison to hand trimmed quality from smaller grows, that seems to be more in the region of £180-£220 ranges.
The probelm is now some of the larger outfits are spraying their products with watered down terpines that are available to buy. Its usually not flushed, smokes harsh, and comes with great big waves of paranoia and anxiety from I guess the chemicals, certainly not from thc as its barely visible on it.