In London on Wednesday, the FTSE 100 was up 0.49 percent to 6,132.2 and the FTSE 250 added 0.91 percent to 10,891.9.
Hotels and restaurants operator Whitbread (LSE: WTB) had the best day on the 100 as it added 3.47 percent to £16.12.
The gains came on news that revenues were up 6.6 percent in the six months ending 16 August and were 8 percent higher in its fiscal second quarter.
Water utilities were right behind. Severn Trent (LSE: SVT) was 2.84 percent higher to £13.42, while Kelda Group (LSE: KEL) added 3.15 percent to 852p.
Insurers were mixed, however, with Standard Life (LSE: SLET) up 2.11 percent to 290p but Aviva (LSE: AV) down 0.99 percent to 698p.
Property developers and house builders were down on the session. Barratt Developments (LSE: BDEV) fell 0.66 percent to 905p, while Persimmon dropped 0.77 percent to £11.55.
Beverage can manufacturer Rexam (LSE: REX), down 1.35 percent to 511p had the worst day on the 100.
The worst performer on the 250 was in the financial services sector, where Bluebay (LSE: BBAY) was 4.76 percent lower to 395p.
PartyGaming (LSE: PRTY) had the best day on the 250, where it gained 23.08 percent to 28p after a more than 7 percent decline Tuesday.