Ron, their website is extremely confusing. From what I can tell unless you pay �20 a month on PAYG and get free unlimited web access (which I assume you don't want) you will pay 30p to access the web in a 24hour period.
Now that to me seems extremely good value. From what I can tell their cheapest top up us �10, and that gives you 300 free texts; 20p per minute call costs to any mobile or landline and 30p for unlimited web access in a 24 hour period.
BUT in the small print unlimited web access is restricted to 25mb per day for 30p. Now that to me is not unlimited - it is very limited but it is more than enough to read your emails.
When I am away in the UK I use my mobile phone to access my emails, and if there is anything that needs attending to I go to a public pc to reply.