Also I think with servicing you have to think what the car cost and how much it would be to replace the engine or gearbox if someone messes up.
At least you know with Honda they will do it correctly and the work is warranted.
As others have said I wouldn't let Halfords or Kwiifit service anything of mine.
Also depends how long you are planning to keep the car, if forever until it breaks, then maybe DIY, or cut a few corners as the resale value won't be affected.
If you change cars every few years then full dealer history does make it worth a bit more.
Also consider a Honda service plan, they are approx £25 a month, like a savings plan, and it pays for your annual service, so you don't have to pay it all in one lump sum.
I've had a £20 a month service plan with my Mazda dealer, for 3 years schedule servicing, it helps spread the cost.