I think Berlingo derived are overkill for your needs imo and I don’t think it comes with a walk in ramp as standard (might be mistaken), plus the Petrol/diesel are manual, which may not suit you. The rest in the group, Combo & Rifter are electric, which is pointless, as you can’t charge at home.
As estates go for example on WPMS:
the SEAT Leon starts at £0 or £239 (auto) + total allowance for the SE with driver assistance pack and the Leon FR
Suzuki Swace (Toyota Corrola) 1.8 hybrid motion auto £643 + toal allowance or 1.8 hybrid Ultra auto £1643 + total allowance.
Vauxhall Astra 1.2 turbo £1193 + total allowance.
However are you going to struggle getting in/out af a typical car derived hight, when perhaps putting too much priority on lifting a chair in and out. I know you can get a grant from WPMS for the additional cost of auto but, won’t they meet the extra cost of having a hoist fitted, then at least your covered with ride height and getting the chair in and out! @BigDave is the one to ask here, as he’s aware of all the in and outs 🙂