You're confusing the cost of building rising with the cost of placing the contract. Once the order is placed (with most contracts), any cost rises are down to the contractor
Whether the estimates have gone up from. Estimate to placing the contract depends on how much inflation was priced in and when the estimate was done, the scheme was budgetet at £300m months ago, and that's the figure mentioned now. Inflation in the industry is more controlled now.
I've not had confirmation its Laings for the extention I'd imagine it is though and yes they lost money on the South stand. They are definitely not doing the whole site as another large MC has been appointed for the hotel.
There is very little change on co-op live Bam got their order latest February 2020 - I cryptically posted the below 12/2/20, it wasnt confirmed in the press until around May 2021, there was even posters on here saying it won't be Bam because of issues with the training ground when it was already agreed.
Bam will be losing a fortune (8 figure+).
Thanks.
So who's ever costing the job best get it right. Not much pressure then.