Various British pylon types are presently unidentified. Those that can be properly represented with a photograph or a diagram are listed here. Items only accessible via Street View are not included, as no pages link to Street View so long as Google maintain incomprehensible URLs.
- Possibly demolished tower along Beauly–Denny (Flickr); same crossarms as SWE PL1 DT type junction tower
- PL16 DDT90 and unknown PL1-era DT90 (Flickr)
- Unknown PL-era tower (Flickr)
- “Christmas tree” type, DD2, running on 33 kV (Flickr)
- Unknown L12, L12X or SSE400 variant
The “Christmas tree” type is a rare Blaw Knox family that may not have a single distinct designation. It can be seen on 132 kV running northeast from Spondon substation. The same type is used between Chesterfield and Alfredon in a single earthwire type with a pyramid peak similar to that used on PL1a; this line is also 132 kV.
The following types are now identified but are stuck here pending a resolution to cataloguing types independently of PL contract.