I needed a new 12v battery not long after I'd bought my IS250. Went to Halfords and they offered to fit a suitable replacement for an extra £10 so I thought why not....
They were a joke, obviously inexperienced and unprofessional and tried to fit the wrong type of battery and then found they didn't have the right model in stock.
In a similar vein, I get my IS250 serviced by a branch of the same group that owns the local Toyota and Lexus franchises, in fact it did used to be the local Lexus dealership until they moved to a posh business park nearby but now it sells used cars and does servicing and bodywork. Been very happy so far with service and value.