Citizens Advice may be able to book a free initial consultation in their office with external solicitor but it's nothing you can't find yourself. As pointed out, there may be more you can do without needing a solicitor, although in this case that seems to have been checked.
How to find more affordable legal advice page here: https://www.citizensadvice.org.uk/wa...le-legal-help/
The Law Society website to help find a list of solicitors here: https://www.lawsociety.org.uk/