I actually went entirely the opposite route
I'd seen a van outside a neighbour's house and asked if they'd done a good job - they had - so I got them in - lovely men who really took care around dad - they did a good job - and added bonus, as they are a local small firm I've been able to call on them for small jobs and one emergency (it turned out it was easy to fix, thank goodness) - because they knew me and dad's situation they fitted us in quickly - and were genuinely surprised when I wanted to tip them.
so maybe worth asking around friends for a recommendation
Good luck with it - definitely worth doing!