you seem to be missing the best bit 😉
Being serious, its easy from there. to DIY:
-flexi to viscous pipe adaptor – £25-50
-register plate – £10-40 depending on if you cut your own, buy, and size
– viscous enamel pipe – £25-50 depending on length, with or without sweeping door (get a door!)
– sundries like fire cement, rope, screws, a bit of angle iron/brackets – say £30
-Tiles on hearth – varies. mine is made of 610mmx610mmmx10mm honed limestone. £156 got enough to do 2 hearhts and some spares…which i duly f***ed up. permenant marker on unsealed limestone doesn’t come off with meths…oh poo. Bottle of sealer, £20.
– Buildng control sign off – £216 rip off in croydon…a good deal less else where.