I acquired one of these beasts from a Hollowell auction several years ago – when warmed up and at full bore it delivers an impressive flame + sound effect too! ( while warming up it makes an impressive flame thrower !!!) It also had a sizeable thirst getting through a tank full in about 30 minutes.
I have not used Base Camp myself yet despite recommending folk go there but feedback I have had from some folk is pretty good.
A very old style ironmongers just round the corner still stock a good range of cup washers – bit pricey but it keeps the business local.
Cheers