Can somebody from locals clarify this road for access or something that impact traffic?

This is probably "B&M Express" not "B&M Bargains".

B&M Express is operated by Heron Foods, who is owned by B&M.

Carrier Fire & Security UK Ltd

onosm.org submitted note from a business:
name: Iridescent Music
phone: 01908597418
website: https://www.iridescentmusic.com
twitter:
hours: Monday-Friday 9am to 5pm
category: Recording & Rehearsal Studios
address: 25 Johnston Place Milton keynes

This link between Turvill End and Pitcher Lane is actually the carpark and private drive of the Becket House Nursing Home. It shouldn't be shown as a possible route for vehicles and needs to be removed, as cars and vans are using it as a cut through.
The pedestrian path shown as red dots next to it is correct.

Bletchley

This gap in the central reservation was permanently closed in early January 2021 and grassed over, to prevent accidents on the H6, Childs Way. The map needs to be changed to reflect this.
The similar gap to the east, opposite Knowl Gate, has also been permanently closed.
Google maps directions have been updated for this, but still currently show the gaps on the maps.

This gap in the central reservation was permanently closed in early January 2021 and grassed over, to prevent accidents on the H6, Childs Way. The map needs to be changed to reflect this.
The similar gap to the west, opposite Ashpole Furlong, has also been permanently closed.
Google maps directions have been updated for this, but still currently show the gaps on the maps.

This road is now open but still has a note about the bridge being replaced.

"New store that opened recently."
POI name: Aldi
POI types: shop-supermarket
OSM data version: 2021-05-29T07:59:45Z
#mapsme