I see routesheet with diversion bits is out on Aukweb or is there anything more to come?
Unfortunately the diversion that Tom has detailed is also subject to a road closure until the end of Oct 2019.
You will most definitely not be able to use the diversion as initially detailed as they are currently excavating down to a depth 16m below the existing road level. This will enable the new bypass to pass under the Heighington to Canwick Road.
I'd amend the outbound diversion details as follows
[Diversion to avoid roadworks:
R @ TLS in Branston centre $ HEIGHINGTON
L on RH bend $ WASHINGBOROUGH and HEIGHINGTON
SO @ X $ WASHINGBOROUGH (Pitts Rd)
L @ T No sign post (Main Rd) (B1190)
SO at mini RAB
R @ TLS $ LINCOLN (B1188)
This will bring you back to the bottom of Canwick Hill into Lincoln where you rejoin the route.
I'd amend the homeward diversion details as follows
L @ TLS $ WASHINGBOROUGH (B1190)
SO at mini RAB
In 200m Turn R no sign post onto High Street (easily missed)
SO @ X $ BRANSTON
R @ T $ BRANSTON
L @ TLS in BRANSTON
Rejoin route