Just for reference, I've just checked the Lexus website, and these are their service rates by model:
LEXUS SERVICE PRICING
Model
Intermediate/Full
CT200h, UX250h
£270 / £480
IS, NX, RC, ES
£290 / £550
GS, SC430, RX
£325 / £630
LS, RC-F, GS-F, IS-F
£395 / £735
UX300e, RZ350e
£150 / £300