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fredtc
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I had a quick look at the manuals. Your existing timer programmer thingy is two channel (hot water / heating) so you will need the two channel LP112. The wiring diagrams look the same. There are some settings you'll have to take note of depending on the type of heating system you have (old gravity type vs. modern pumped).
Read the manuals. If you feel comfortable give it a go, but if you are in any doubt I'd ring round for some quotes. It's a quick job if you know what you are doing so it won't be £££ to get a pro in to do it for you, but a slow and potentially risky one if you don't.
https://www.draytoncontrols.co.uk/sites/default/files/UG.%20IG.%20LP111.pdf
https://www.draytoncontrols.co.uk/sites/default/files/IG.%20SM1.pdf
Howard
Get the installation instructions for both. Compare the wiring diagrams. It is unlikely that the more modern one requires more input / output or a different power supply. If it does, then yes you need someone to help you. If it does not, it's a diy job with all the usual precautions when working around electric stuff.