The Tiny Love Super Mat would definitely be on my list of must-have items for anyone expecting a baby, and right now it's just £14.59 at Amazon, down from £39.99. This is £19.99 at Argos right now and as much as £39.99 from Kiddicare.
Suitable from birth until your baby is around 12 months old, the Tiny Love Super Mat is an extra large activity mat which features a removable mirror as well as textured fabrics and sensory activities. My little girl adored this mat and I just loved having somewhere big enough for us both to lounge around on. I found it really brilliant for encouraging tummy time, too.
It's a good size for popping in the shopping basket underneath your buggy and taking to the park or beach, too, as it's also ideal for outdoor use.
Delivery from Amazon is free if you spend £20 or more, so if you're not a Prime customer it's probably worth spending an extra fiver on any other essentials you need so you can save on the delivery charge.