Thanks for your comments. Yes I'll certainly challenge the Marshall warranty company.
I obviously misunderstood the garage explanation as they've replaced the ECAP Pipe (£103.56) and Charcoal Canister (£109.50) plus £195.50 Labour all plus VAT giving a grand total of £490.27 which seems pretty steep to me!! Current mileage at repair was 32,780.
The Service Plan included servicing/MOT for years 1 through 5 as detailed below. I did query Service 4 (Sep 2024) with them today as it mentioned 'fuel' - they did replace the spark plugs and air filter but nothing on mentioned on 'fuel' but I guess that refers to diesels.
S1 - Service 1
Due September 2021
Oil + Filter
A1 - Air con service
Due September 2022
Air con service
S2 - Service 2
Due September 2022
Oil + Filter + Pollen
A2 - Brake fluid change
Due September 2023
Brake fluid change
A3 - MOT
Due September 2023
MOT
S3 - Service 3
Due September 2023
Oil + Filter
A4 - MOT
Due September 2024
MOT
A5 - Air con service
Due September 2024
Air con service
S4 - Service 4
Due September 2024
Oil + Filter + Pollen (Plugs + Air + Fuel if
app)
A6 - Cam Belt
Due September 2025
Cam Belt
A7 - Brake fluid change
Due September 2025
Brake fluid change
A8 - MOT
Due September 2025
MOT
S5 - Service 5
Due September 2025
Oil+Filter
All service