OK... The first thing to say is that you don't actually need a solicitor yet. So far, all you have from him is a lot of noise and some threats that will probably turn out to be empty ones.
If and when you get a letter from his solicitor, then you can get yourself some legal advice. The info below might then be useful...
But even then, don't worry about it. You have done nothing wrong and are behaving reasonably. You have more to gain than he does, if solicitors get involved. :) A solicitor will act as a 'buffer' so that you don't have to deal directly with him again.
I don't know if Women's Aid have lawyers - give 'em a ring and ask :) Their general enquiries number is 0117 944 44 11.
I do know that if you need to get an injunction against him to stop him harassing you, there are special rules that mean that you will get legal aid. You are probably not at this point yet, but remember it, in case he cranks up the abuse. :(
You can check whether you are eligible for legal aid on this legal aid calculator. You have to enter your income and expenditure.
If you're on one of the following benefits, you will automatically qualify:
Income Support
Income-based Jobseeker?s Allowance
Income-based Employment and Support Allowance
Guarantee Credit.
Remember you should be able to get a short (10-30 min) free legal consultation from many solicitors, whether or not you qualify for legal aid. Solicitors offer this as a way of drawing in business. Google 'free legal consultation' and your town, and you should get a few results.
You can also get some free legal advice over the 'phone from the Community Legal service . Their website says:
Get free confidential legal advice now
Call 0845 345 4 345
Mon - Fri 9am - 8:00pm
Sat 9am - 12:30pm
Calls from 4p/min - or get us to call you back
There is also a web-based service - link here