Not necessarily Series 2 but UKMS which uses pretty much any/everything available, including the Bonomi equipment from Series 2, capable of up to 140mph
The SICAT SA range, used on Shields-Gourock' OLE renewal scheme, and the reopened Larkhall branch, has also been added in; the new OLE on the Stevenage Turnback project has cantilevers from that range.
SICAT's also been picked for Transpennine as the new masts will be shorter than they would need to be for Bonomi/Alstom equipment (as used on S2). They also allow for longer span lengths (along-track structure separation) than Bonomi/Alstom/F+F equipment; the maximum with those cantilevers is 65m, but with SICAT it increases to 74m, meaning less structures overall on plain line sections without curves.
However, all of these bits of equipment are only suitable for 125mph; while early versions of UKMS included Series 1 equipment, the drawings were never formally accepted. As a result, the Series 1 MPA Anchor Portals, the Monobooms (i.e. tensorex portals), the Q-boom portals, the hook-and-pin TTCs, and even the single telescopic Series 1 STC arms that hold the gooseneck cantilevers aren't in the range, and special bespoke derogations have to be obtained; they've done this on the MML for example.