I'll downgrade to the £35 per month tariff and then add on the £7.50 Unlimited Text Bolt-on. It'll only save me £2.50 per month but I'll not have to worry about going over my text limit and facing a large bill.
I've filled out the tariff change request form online, maybe I'd be better phoning instead?
Could I have the link to the tariff change request form please. Will be hand for future reference!