Thanks Ollie, I need to get a router first, do you recommend any 1/2” router fir the job.
I would say the bigger motor the better for this type of work. I have an old Makita that is pretty bullet proof I have done many a slab and lots of worktops etc with it.
We used to use the Dewalt ones which are the same as the old Elu ones, and the trend t10 they are strong and last very well but I never liked the switch on them, they require an awkward hand position for the trigger safety release, not good for long jobs or repetition.
I would strongly suggest actually handling the machine, because if you need to awkwardly hold a switch on whilst flattenning a big slab you will soon hate it.
Also the base design might be important as to how you make the sled, a perfectly round base is nice because it doesn`t matter if you change the angle as you bring the machine back and forth accross the slab in the sled, whereas a base with flat sides must be kept parallel which can be awkward as well.
The American style non plunge type of router are actually good for this type of thing but hard to find in the uk and not as handy for other stuff.
I would go for a proper brand, not unbranded or a wickes or B and Q special. Makita, Metabo, Festool, Hikoki, Triton, DeWalt, Bosch.
Ollie