I was in the local Homebase and B&Q yesterday, both seem to have fair stocks.
If you have a B&Q Wednesday 10% discount card for pensioner's, then use that, or apply for one in store. With Homebase, watch for regular special deals, and if you have an Argos store-card, then that will also help, with possible interest free finance.
I bought myself a self propelled petrol mower a couple of years ago. Much easier on my aching back and no cables to get tangled in. Wouldn't be without it now. Bought it online from Wyvale Garden Centres and it was delivered in 2 days.
"easiglide 300" - that's a hover mower. I don't advise getting a 'hover' mower. All that tugging about. My mowers just given up as well. I'll be getting a new one with metal blade and wheels on this time.
I have a big lawn and have tried many mowers. If you like "stripes" you need a driven roller at the rear. I have found that, whilst very expensive, the Honda range is by far the most reliable. My last one went on for over 10 years of heavy use. A Rotary blade is more practical but cylinder mowers are for the perfectionist! I use a local garden machinery specialist.