Unlock Unlocking

So I'm waiting for my bus home after work and staring across the road, when I find I'm looking at the following shop front (snapped by my mobile):

Why would the shopkeeper cram three letters onto one square when every single other letter gets its own square? I don't think it's simply a case of running off two copies of 'UNLOCK' and then one copy of 'ING' - the top 'UNLOCK' looks different to the bottom 'UNLOCK'.

And - perhaps more pertinently for this blog - what does the 'ING' add to this advertisement for services? Could it be that 'unlocking' is actually a separate service to 'unlock'? The drivers behind the shopkeeper's actions in this apparently insignificant affair fascinate me.

If it transpires that others are interested in the answers to the above queries, I promise to go into the shop and ask for the answers in due course. To register your interest, post a comment below.