The LGW plans require no public access tunnels just a few minor under tax way tunnels for ramp traffic, little more than a culvert with a top on.
.....which will be privately financed by the airport.
The A23 which currently goes under the airport to the west of the rail link will be moved in an arc back towards the M23 with all long stay car parks served from it and a new airport link to the M23 at the current site of J9.
This will be publicly funded won't it, just like the M25 at Heathrow.
The issue here is two-fold. Firstly, the scale of the projected public-funding requirement relating to LHR R3 in absolute terms. And secondly, the fact that ALL recent large-scale [£1Bn+] public-investment in infrastructure initiatives has gone exclusively to projects located in London and the SE. There are a number of compelling infrastructure priorities in the regions which deserve their own bite of public funding before the SE feasts yet again on national resources.
Obviously public funding would be involved in surface access infrastructure improvements and many are happening/have happened before any decisions on the rwy have been made.
And clearly the scale of the investment is larger now than it would have been had the rwy(s) been built in the 1970s (for example, back then there was no M25).
As you should know, dithering and indecision comes with a price, not just infrastructure costs but also the endless reviews, studies and commissions over the intervening 40 years.
Incidentally, the type of projects I'm referring to are the recently-proposed HS3, a transpennine motorway linking Sheffield with cities west of the Pennines, and a complete replacement for Liverpool Lime Street Station with its massively-congested Victorian bottleneck approaches. Other regions put forward similar compelling projects, though I'll let people more familiar with those regions outline their own priorities. BTW, I'm not aware of any move from MAN to request large-scale public-funding from the exchequer at this time. The proposals for the terminals redevelopment project call for private-sector financing.
All the above are also needed and needed ASAP.
It's not either/or.
Actually it looks like its "neither/nor" to the above AND to more rwys at Heathrow.
Presumably, at some point in the past, you've had a poor experience at LHR? You may be reassured to know that the 2013 CAA passenger survey recorded an 87% satisfaction rate with LHR, and Heathrow was voted 3rd best airport in Europe and 8th in the world in the 2014 Skytrax awards. So thankfully most passengers don't seem to suffer the experience you did.
LHR-5 has also been getting "best terminal" awards year after year.