click here Freeuk is a free dial-up ISP, no fees, just pay for the cost of a local call.
This would seem to be ideal for your intended use of 3 to 5 hours per month. If your calls are in the evening/weekend, you will be paying approx. £3.00 per month in phone charges, even if some of your calls are in the day, you should still be able to stay within your budget.
This ISP is also a good choice if you wish to make your calls from different phone numbers, as there are no restrictions on where you call from. The cost of the call is billed to the phone account you log on from.
First time connections most times and a good quality service with excellent help via phone, [Local rate] or by the very comprehensive on-line help and tutorials on all aspects of setting up/using your account. j.