Hi Jogara long time no speak!

Have you tried Aluminium Warehouse - https://www.aluminiumwarehouse.co.uk/aluminium, they offer:

FULL SIZE SHEET
SHEET CUT TO SIZE
FIVE BAR TREADPLATE
FIVE BAR CUT TO SIZE
PLATE CUT TO SIZE
FLAT BAR
ROUND BAR - UP TO 2 IN
ROUND BAR - ABOVE 2 IN
SQUARE BAR - UP TO 2 IN
SQUARE BAR - ABOVE 2 IN
ROUND TUBE
SQUARE TUBE
RECTANGULAR TUBE
ANGLE
CHANNEL
T-SECTION
Z-SECTION
I BEAM
MOULDINGS
EASYFIX TUBE SYSTEM
POLISHED SECTIONS
MISCELLANEOUS SECTIONS
ANODISED SECTIONS
PLASTIC CAPS

I have used them quite a few times now and always received a fast turn around and stock 100% what I asked for.