I'm just looking at RIAS now. From what I've seen on their website, they use a variety of 0845 numbers, but when you look at the
claims page, it's full of 0870 numbers.
A look at their site on
Internet Archive reveals that they moved to their current address quite recently, probably just over a year ago.
The old address is:
RIAS House, 37 Commercial Road, Poole, Dorset, BH14 0HN
The new address is:
RIAS House, Deansleigh Road, Bournemouth, Dorset BH7 7DU
They used to use 01202 715 389 for customer services, but this is now out of service.
From the website I see they use numbers prefixed 01202 254.
There are also a couple of 01202 715 numbers in the database. Another one which isn't in is
01202 715512.