Solicitors would be my recommendation. Ring round a few locals for prices. Ideally get a recommendation from someone you trust. NEVER appoint a Solicitor or Will Writing Firm as Executor unless there is no-one else you can trust to do the job.
More complicated Estates and Inheritance Tax Planning may need the advice of a STEP member https://www.step.org/about-step/public
Ours were a few hundred when last done some ten years ago and there's currently still no real need to update as it was well written and things haven't really changed. IIRC when quoted I assumed it was each and it was for the pair of Wills.
DIY Wills can be a minefield. Check out the MSE Probate forums for the tales of woe.
