Autosleeper underslung gas tank replacement

Oh Just been told my 4 year old Auto Sleeper Symbol Plus gas tank is showing signs of corrosion powdering etc. on the habitation check. I was issued with a ‘gas tank disclaimer form’. Does anyone know or have had done a replacement and fitting service down south. I live in Brighton. Thanks in anticipation!

4 years seems extremely unusual to have corroded to such an extent. One member on here had a new tank fitted by Propex in Ringwood Hants
Maybe your location could be the cause, sea air!
My tank is now 14 years old and still looks almost new, checked every year .