R2M8N Playset parts using Arduino Uno 

WTV020SD-16P £2.59
http://www.banggood.com/WTV020-SD-16P-U-Disk-Audio-Player-SD-Card-MP3-Voice-Module-p-78682.html?p=ZL2104540902201404G2

LCD Diplay I2C £2.49 
http://www.banggood.com/IIC-I2C-1602-Blue-Backlight-LCD-Display-Module-For-Arduino-p-950726.html?p=ZL2104540902201404G2

Ultrasonic Sensor HC-SR04 £2.76 
http://www.banggood.com/Wholesale-Ultrasonic-Module-HC-SR04-Distance-Measuring-Ranging-Transducer-Sensor-p-40313.html?p=ZL2104540902201404G2

Breadboard £1.20 
http://www.banggood.com/Mini-Solderless-Prototype-Breadboard-170-Points-For-Arduino-Shield-p-74814.html?p=ZL2104540902201404G2

Arduino UNO Compatible (No cable) £3.76 
http://www.banggood.com/UNO-R3-ATmega328P-Development-Board-For-Arduino-No-Cable-p-964163.html?p=ZL2104540902201404G2

Connector £1.03 
http://www.banggood.com/2Pcs-9V-Battery-Buckle-Snaps-Power-Cable-Connector-For-Arduino-p-971303.html?p=ZL2104540902201404G2

Battery Duracell 9V £2.20
http://www.ebay.co.uk/itm/Duracell-MN1604-Plus-Power-9v-

Batteries-Pack-of-1-/221917772415?hash=item33ab547a7f:g:VOEAAOSwcwhVP1mw

or Lipo Battery £5.26
http://www.banggood.com/Giant-Power-LIPO-7_4V-2S-450MAH-25C-Low-Resistance-Battery-Good-Consistency-Ultra-Light-p-995590.html?p=ZL2104540902201404G2

Jumper Wire Male to Female £1.32
http://www.banggood.com/40pcs-20cm-Male-to-Female-Color-Breadboard-Cable-Jump-Wire-Jumper-p-992837.html?p=ZL2104540902201404G2

Jumper Wire Male to Male £1.41
http://www.banggood.com/40pcs-20cm-Male-to-Male-Color-Breadboard-Cable-Jump-Wire-Jumper-p-70127.html?p=ZL2104540902201404G2

LED 3mm Blue £1.50
http://www.banggood.com/100Pcs-20Ma-F3-3MM-5Colors-Ultra-Bright-LED-Diode-p-966102.htm?p=ZL2104540902201404G2

LED 5mm Blue £1.68
http://www.banggood.com/100Pcs-20Ma-F5-5MM-5Colors-Ultra-Bright-LED-Diode-p-966103.html?p=ZL2104540902201404G2

JST Switch £1.44
http://www.banggood.com/OnOff-Switch-Connector-Plug-JST-Male-Female-Wire-For-RC-Li-po-Battery-p-77399.html?p=ZL2104540902201404G2

Push Buttons £1.59
http://www.banggood.com/100pcs-Mini-Micro-Momentary-Tactile-Tact-Switch-Push-Button-DIP-P4-p-917570.html

***Speaker £2.20 
http://www.ebay.co.uk/itm/Adafruit-Thin-Plastic-Speaker-w-Wires-8-ohm-0-25W-/161393801779?hash=item2593d1fa33:g:LMIAAOSwxH1T633W

***2-LED Simple Flash Circuit Board Module £1.38
http://www.ebay.co.uk/itm/2-LED-Simple-Flash-Circuit-Board-Module-Electronic-Production-Project-DIY-Test-/381305456994?hash=item58c7938962:g:Q0oAAOSwGzlTslZe

***Mandatory Sandisk Micro SD Card 2GB £3.50 
http://www.ebay.co.uk/itm/Micro-SD-Card-2GB-SanDisk-/272031103921?hash=item3f56513bb1:g:09sAAOSwYHxWMoxV