VoIPtalk Unlimited Package

Very Good and Very Reliable, for phoning:
UK Landlines and Landlines of other Selected Nations.
Distressing to: use up the extra 'top up' credit, and,
get caught out with low credit, when calling:
08 456 070 999 to Sussex Police, and,
08 457 212 212 to Co-operative Bank.
Could Voiptalk provide a set £'s/month add on fee,
for a set mins/month to 08 456's and 08 457's ?
Would that help, or not ?