There are a few threads on here noting service prices and the differences etc...be worth searching them and checking what's included in the one you're being quoted for.
Services for most people are every couple of years. One is a "standard" service. The other is the "standard" service plus a couple of extra items (lambda sensors and an additional engine filter - the "carbon can" IIRC). They alternate on the 2yrly cycle.
The "standard" service can be haggled for around 1k (though the official price is a min of £1,350 I seem to remember). The other is a chunk over £2k typically (and the price for the parts is the largest element of difference).
Your £1.5k is smack in between those so it's either expensive for a "standard" service or very cheap for a bigger one
At less frequent intervals there are other things to attend to as well - e.g. spark plugs - which will add to the cost of course.
Would be worth calling Nareman to confirm what will be done for the price quoted so you can compare apples with apples. He's a good guy and I'm sure will be fine letting you know.
A *big* tip here is to ask to supply your own oil. The dealer network is obliged to use the distributor/manufacturer's oil supply and the cost of it is silly. You can source the exact same spec oil, have a litre or two left over (car needs 10l or a bit less and buying 3x 4l packs is often cheapest) and save £100-200. It's worth considering supplying other items/specifying them not to be changed too (e.g. make sure your screen washer tank is full), but oil's the big one.
The other thing to explore is whether they'll throw in an MOT - they often will and that saves you something like £30.
(HR Owen's prices are daft. They were when I was pricing up last September or so. I suspect their location and customer demographic means most people don't even query these costs. Either that or they don't want service business!).
Edited to add...the annual bigbob notes is only really applicable if you do more than 12k miles a year. And the prices I note do not include alignment. I have a place local to me that can do that job for £60.