Tadalafil, immediately after surgery, and some surgeons now start even a few days before surgery.
The pump, ask your consultant, but 8 weeks after catheter out is quite common.
They are both available on the NHS in principle, but some areas won't pay for one and/or the other. If you buy the pump yourself, ask the retailer for a VAT exemption form first, as you are buying it as a medical appliance (zero rated), not a sex toy (20% VAT).