If you were interested in overall price it's about £5.7K. To be fair the plumber includes for hanging another radiator and fitting an outside tap so I'd say take £500 off that labour figure.
Grohe vitatlio shower Start 250 - B&Q £225.00
First fix outside tap and bathroom (plumber) £550.00
Stainless radiator -via klarna £300.48
Telescopic joist brackets for rad pipework £22.05
skip - £222.00
protiler tools prep gear £651.06
addiitonal washers, shower drain, waterproof tape £120.00
Shower Tray - Mira Flight 700x1500 - Plumbworld £388.98
Porcelanosa tiles £967.90
Tile Snapper (bought for 80 and sold for 40 £40.00
Grout and silicone matcher £40.00
many many tubes of silicone/Stixall etc… £70.00
units, cover panel & worktop - ergonomic designs £641.96
Mirror - PEBBLE GREY £116.99
toilet £127.34
Toilet seat and cistern and sink £344.00
Shower Glass £194.98
2nd fix plumbing (+ parts) £723.90
Edit: actually I realise the above doesn't account for about 160 quid of sound insulation so add that to figures!