what budget do you have in mind?
we did ours 3 months ago, similar size
Tiles - 60 x 40 travertine - walls & 20 x 10- floor - £1100 with adhesive & grout -store- Tile depot (were very good, replaced any cracked or miss-matched tiles straight away.)
Bath - 180cm x 80cm - £600 (hate small baths) store -Porcalinosa
square close coupled Toilet & cistern - £400 ( reduced from £700)- store - B & Q
Square sink, wall mounted -£25 - store - bathstore
Good quality heavy chrome taps, hidden fittings - £150 per set ( sink & bath) Store - QS Supplies ( online)
concealed shower controls - £260
good quailty tiler - £700 - look on tilers forum, plenty of people looking for work
with other bits & pieces, plumbing bits, towel rail, bathroom cabinet, ip3 rated ceiling lights, 30mm travetine window sill top, totalled just under £5k
& this was with me doing all the plumbing & electrics
depends on how far you want to go
once we added it all up, we were a bit suprised
hope this helps