King size mattress (Bexleyheath DA7)

King size mattress, around 4.5 years old and in good condition. There are some stains but some bicarbonate soda or stain remover would probably get it out, also nothing a mattress topper won't hide. Only getting rid as we got given another mattress, we were perfectly happy with it before! See photos for brand/label and as mentioned stains. Collection only