LONDON, Oct 23 (Reuters) -U.S. WTI Midland crude differentials rose on Wednesday after fresh trade in the Platts window, while North Sea Forties offers were met with no buying interest.

* Top British North Sea producer Harbour Energy HBR.L wants to sell stakes in North Sea oilfields and is reviving plans for a U.S. listing, sources said, as more firms scale back investments ahead of new tax increases on the sector.

* Norway's Equinor EQNR.OL said on Wednesday it was preparing to survey the damage at its Sleipner B gas platform in the North Sea, which was shut late on Monday following a smoke alert in an electrical facility.

PLATTS WINDOW

* Indications are on a free-on-board (FOB) basis unless marked as cost, insurance and freight (CIF) or delivered at place (DAP).

* WTI Midland: Vitol sold a Nov. 16-20 cargo to Petroineos at dated Brent plus $1.65 CIF Rotterdam.

* The deal level equated to around dated plus 61 cents on a FOB basis, Reuters calculations showed.

* On Monday, Phillips 66 had offered a WTI Midland cargo with Nov. 10-14 dates at dated Brent plus $1.60 CIF Rotterdam.

* Forties: Glencore offered a cargo with Nov. 11-13 dates at dated plus 10 cents.

* Forties last traded a week ago, when Glencore bought a cargo loading Nov. 10-12 from Shell at dated Brent minus 5 cents.

* Forties remained the cheapest grade and set the dated Brent value on Tuesday.

Reporting by Robert Harvey; Editing by Shinjini Ganguli

 NORTH SEA CRUDE OIL DIFFERENTIALS AND OUTRIGHT PRICES: 0#BFO-DIF 0#C-E Dated BFO BFO- Brent BFO-BRT BFO-E Forties BFO-FOT FOT-E Oseberg BFO-OSE OSE-E Ekofisk BFO-EKO EKO-E Monthly North Sea crude loading programmes O/LOAD OPEC OPEC NSEA North Sea CRU crude oil PROD oil products DRV derivatives PRO/E European products OILOIL NYMOIL, IPEOIL, OILSPD, OILARB CRDWLDPRODEUR, PRODUS, APROD ENERGY energy speed guide CRUDE/1 crude speed guide