I have done some research into this company as far as pricing is concerned and all is not as it would seem. There are quite a few items not included in the "Service B" that are all included with Lexus.
They include:
Rear Diff oil replacement - £50 + VAT
Air-Con filter - £35 + VAT
Coolant replacement - £45.50 +VAT
Brake Fluid replacement - £45.50 +VAT
I am not 100% sure they would do the "Additional Inspections" as part of this either such as:
Drive Belts, Charcoal Canister, and Valve clearances.
The total price if I were to have all this done in the 60,000 6yr service is £500 assuming no extras. Lexus quoted 582.04 inc VAT. Of course this does not include the Timing Belt which is due at either 6 years or 100,000 miles (the book says 100,000 miles only but Lexus said whichever sooner)
It is cheaper and if you haven't the luxury of a trusted local then could be a good option. The guy did tell me that they would not replace the fluids unless needed and would call to confirm. They would however check them all for quality. As a result the cost could be as little as £400 odd.
I am going to give them a go and will post the outcome.