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Description
Fifteen ex-US Navy Fletcher-class destroyers were transferred to the Royal Navy as part of the 1963 US-UK Mutual Defence Agreement, with all being converted to Royal Navy standards. Once in shipyard hands, the old ships' superstructures and funnels were almost completely cut away and replaced with prefabricated structures. The main radar and ESM equipment was carried on tall latticework masts that surrounded two inelegent exhaust flues in lieu of funnels.
Despite their ungainly appearances, these ships were very capable and much-loved by their crews, remaining in service for over 20 years before being replaced with the newer Type 22 large frigate design in the 1980s.

Specifications (post-conversion):

Class & type: E-class destroyer (ex-Fletcher class)
Displacement: 2,050 tons standard, 2,500 tons full load
Length: 376.5 ft (114.8 m)
Beam: 39.5 ft (12.0 m)
Draft: 17.5 ft (5.3 m)
Propulsion: 4 × Babcock & Wilcox or Foster Wheeler boilers; two General Electric or Westinghouse geared steam turbines, 2 screws
Installed power: 60,000 shp (45 MW)
Speed: 36.5 knots (67.6 km/h; 42.0 mph)
Range: 5,500 miles (8,850 km) at 15 knots
Complement: 329

Sensors:
1 × Type 965 air-surveillance radar with outfit AKE(1) aerial
1 × Type 993 surface search/target-indication radar
1 × Type 974 navigation radar
1 × Type 37 director (guns)
2 × Type 262 Close Range Blind Fire directors (Sea Cat)
1 × Type 174 medium range search sonar
1 × Type 170 attack sonar
1 × Type 162 bottom search sonar

Armament:
2 × QF 4.5-inch (113 mm) Mk. III guns in single twin mounting BD Mark IV
4 × Oerlikon 20 mm guns
1 × 4 21-inch (533 mm) tubes for torpedoes Mk.VIII & Mk.30
4 × Sea Lance anti-ship missiles in box launchers
2 × GWS-21 quadruple Sea Cat SAM launcher
1 × Squid triple depth charge mortar

Aviation facilities:
Landing pad and hangar for single Westland Wessex HAS.1/HAS.3 helicopter, or two Westland Wasp HAS.1/HAS.2 helicopters

* * *

You can see the rest of the stuff in this AU here: Timeline 27-10-1962

Description
Fifteen ex-US Navy Fletcher-class destroyers were transferred to the Royal Navy as part of the 1963 US-UK Mutual Defence Agreement, with all being converted to Royal Navy standards. Once in shipyard hands, the old ships' superstructures and funnels were almost completely cut away and replaced with prefabricated structures. The main radar and ESM equipment was carried on tall latticework masts that surrounded two inelegent exhaust flues in lieu of funnels.
Despite their ungainly appearances, these ships were very capable and much-loved by their crews, remaining in service for over 20 years before being replaced with the newer Type 22 large frigate design in the 1980s.

Specifications (post-conversion):

Class & type: E-class destroyer (ex-Fletcher class)
Displacement: 2,050 tons standard, 2,500 tons full load
Length: 376.5 ft (114.8 m)
Beam: 39.5 ft (12.0 m)
Draft: 17.5 ft (5.3 m)
Propulsion: 4 × Babcock & Wilcox or Foster Wheeler boilers; two General Electric or Westinghouse geared steam turbines, 2 screws
Installed power: 60,000 shp (45 MW)
Speed: 36.5 knots (67.6 km/h; 42.0 mph)
Range: 5,500 miles (8,850 km) at 15 knots
Complement: 329

Sensors:
1 × Type 965 air-surveillance radar with outfit AKE(1) aerial
1 × Type 993 surface search/target-indication radar
1 × Type 974 navigation radar
1 × Type 37 director (guns)
2 × Type 262 Close Range Blind Fire directors (Sea Cat)
1 × Type 174 medium range search sonar
1 × Type 170 attack sonar
1 × Type 162 bottom search sonar

Armament:
2 × QF 4.5-inch (113 mm) Mk. III guns in single twin mounting BD Mark IV
4 × Oerlikon 20 mm guns
1 × 4 21-inch (533 mm) tubes for torpedoes Mk.VIII & Mk.30
4 × Sea Lance anti-ship missiles in box launchers
2 × GWS-21 quadruple Sea Cat SAM launcher
1 × Squid triple depth charge mortar

Aviation facilities:
Landing pad and hangar for single Westland Wessex HAS.1/HAS.3 helicopter, or two Westland Wasp HAS.1/HAS.2 helicopters

* * *

You can see the rest of the stuff in this AU here: Timeline 27-10-1962