Following discussions on another telephone group, I came across a useful recommendation of a reliable SMS service for sending texts from your PC.
Thanks to TheOldFellow for the following testimonial:
Cardboardfish's VIP service has been 100% reliable and fast for me, been using it for years.
Got to start with UKP15, but each text is only 5p.
Many of us have a lot of inclusive texts with our mobile contracts, so it wouldn't pay us to use this.
However, those with pay & go mobiles, whose every text may cost them 10 - 12p, may want to consider an alternative like this.
So too may those too lazy to cope with all the key presses needed for sending SMS from a mobile.
Details of the service may be viewed
here.