The full stop at the end of Woofgang's link has corrupted it.
Here it is again:
https://www.gov.uk/wills-probate-inheritance
As the link indicates, a grant of representation (in the form of 'probate') isn't always required when the estate doesn't include land, property or shares.
However banks (and other financial institutions) will each have their own rules about when they'll hand over funds to executors without a grant. So it might still be necessary to seek probate (which, for a simple estate, is really easy anyway - it most definitely doesn't require the involvement of a solicitor).