This is where I put the pin. How did it get moved? It's a mystery. We will never know.

Course of Mylnes Culvert incorrect at this point. I have an Environment Agency map showing the correct course:
• St Stephens Street
• Under St Stephen's Garden
• Along Marsh Street to Prince Street.
A stormwater culvert runs from my pin and under the Centre to Cascade Steps. This is the culvert that many Bristolians believe is the River Frome, as it was before the construction of Mylnes Culvert.
If you need to see the map you can email me: [email protected].
Thanks for giving this your attention.
Jack

This site is now Global Centre for Rail Excellence, currently under construction. There are various track diagrams online. This one is very clear: https://expedition.uk.com/project/global-centre-of-rail-excellence/
As you can see, the rail line enters from bottom left and feeds various test tracks.
There's a Wikipedia entry at https://en.wikipedia.org/wiki/Global_Centre_of_Rail_Excellence. This will be a significant facility for south Wales and the UK rail industry, and updating the map will be widely appreciated. Thanks. JML

Old Malt House is a community arts and music venue named Jam Jar. See https://www.thejamjarbristol.com

"A company which bought Nelson Street car park in November has submitted proposals to demolish the structure and replace it with student accommodation. It would be replaced by a 20-storey building with 565 student beds under the plans. Downing, the new owners of the building, said the scheme would bring "health and wellbeing benefits" to the area. It has not yet submitted a formal application but planning documents detail what the company has in mind."
Source: BBC, https://www.bbc.co.uk/news/uk-england-bristol-68240078

Premier Inn and Bristol Fashion pub now boarded up. Building to be demolished, likewise Haymarket Walk, and replaced with two residential towers. Development is to be named St James Square. See https://olympianhomes.com/building/st-james-square

This is now student accommodation named Canvas Bristol. See https://www.canvas-student.com/locations/united-kingdom/bristol/bristol/

Debenhams building will be demolished and replaced with a new development featuring a 28-storey tower. A new street, Barr Street, will run through the middle of the development as a northward extension of Merchant Street. More here: https://www.bristol247.com/news-and-features/news/striking-landmark-debenhams-site/